bhnd(4): Remove a double word in a source code comment

- s/of of/of/

MFC after: 3 days

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

bhnd(4): Correct a typo in a source code comment

- s/in he/in the/

MFC after: 3 days

[mips/broadcom]: Early boot NVRAM support

Add support for early boot access to NVRAM variables, using a new
bhnd_nvram_data_getvar_direct() API to support zero-allocation direct
reading of NVRAM variables from a bhnd_nvram_io instance backed by the
CFE NVRAM device.

Approved by: adrian (mentor)
Differential Revision: https://reviews.freebsd.org/D9913

bhnd(4): NVRAM serialization support.

This adds support for:

- Serializing an bhnd_nvram_plist (as exported from bhnd_nvram_store, etc) to
an arbitrary NVRAM data format.
- Generating a serialized representation of the current NVRAM store's state
suitable for writing back to flash, or re-encoding for upload to a
FullMAC device.

Approved by: adrian (mentor)
Differential Revision: https://reviews.freebsd.org/D8762

bhnd(4): Add support for exporting all (or a subtree) of NVRAM
properties backed by an NVRAM store.

This will be used to support:

- Serializing the current NVRAM state for writing back to flash.
- Exporting subsidiary device paths for serialization and upload to fullmac
chipsets.

Additionally, this includes an improvement to BCM-RAW format detection
to avoid matching on BCM-TEXT NVRAM data.

Approved by: adrian (mentor)
Differential Revision: https://reviews.freebsd.org/D8761

bhnd(4): NVRAM device path support.

Implements bhnd_nvram_store support for parsing and operating over NVRAM
device paths, and device path aliases, as well as tracking per-path NVRAM
variable writes.

Approved by: adrian (mentor)
Differential Revision: https://reviews.freebsd.org/D8760

bhnd(4): Unify NVRAM/SPROM parsing, implement compact SPROM layout encoding.


- Defined an abstract NVRAM I/O API (bhnd_nvram_io), decoupling NVRAM/SPROM
parsing from the actual underlying NVRAM data provider (e.g. CFE firmware
devices).
- Defined an abstract NVRAM data API (bhnd_nvram_data), decoupling
higher-level NVRAM operations (indexed lookup, data conversion, etc) from
the underlying NVRAM file format parsing/serialization.
- Implemented a new high-level bhnd_nvram_store API, providing indexed
variable lookup, pending write tracking, etc on top of an arbitrary
bhnd_nvram_data instance.
- Migrated all bhnd(4) NVRAM device drivers to the common bhnd_nvram_store
API.
- Implemented a common bhnd_nvram_val API for parsing/encoding NVRAM
variable values, including applying format-specific behavior when
converting to/from the NVRAM string representations.
- Dropped the now unnecessary bhnd_nvram driver, and moved the
broadcom/mips-specific CFE NVRAM driver out into sys/mips/broadcom.
- Implemented a new nvram_map file format:
- Variable definitions are now defined separately from the SPROM
layout. This will also allow us to define CIS tuple NVRAM
mappings referencing the common NVRAM variable definitions.
- Variables can now be defined within arbitrary named groups.
- Textual descriptions and help information can be defined inline
for both variables and variable groups.
- Implemented a new, compact encoding of SPROM image layout
offsets.
- Source-level (but not build system) support for building the NVRAM file
format APIs (bhnd_nvram_io, bhnd_nvram_data, bhnd_nvram_store) as a
userspace library.

The new compact SPROM image layout encoding is loosely modeled on Apple
dyld compressed LINKEDIT symbol binding opcodes; it provides a compact
state-machine encoding of the mapping between NVRAM variables and the SPROM
image offset, mask, and shift instructions necessary to decode or encode
the SPROM variable data.

The compact encoding reduces the size of the generated SPROM layout data
from roughly 60KB to 3KB. The sequential nature SPROM layout opcode tables
also simplify iteration of the SPROM variables, as it's no longer
neccessary to iterate the full NVRAM variable definition table, but
instead simply scan the SPROM revision's layout opcode table.

Approved by: adrian (mentor)
Differential Revision: https://reviews.freebsd.org/D8645