MFC r332387: Annotate geom modules with MODULE_VERSION

GEOM ELI may double ask the password during boot. Once at loader time, and
once at init time.

This happens due a module loading bug. By default GEOM ELI caches the
password in the kernel, but without the MODULE_VERSION annotation, the
kernel loads over the kernel module, even if the GEOM ELI was compiled into
the kernel. In this case, the newly loaded module
purges/invalidates/overwrites the GEOM ELI's password cache, which causes
the double asking.

This MFC commit differs slightly from head, due to pc98 removal. These
changes were trivial and should be obvious.

MFC r323108, r323125, r326047-r326049

r323108:
Add efimedia attribute for all GPT partitions.

r323125:
The hard drive media device path contains the size of the partition,
not its end. This makes the GEOM efimedia attribute match the
FreeBSD:Boot1Device environment variable now.

r326047:
Implement efi media tagging for MBR partitioning types.

r326048:
Remove trailing whitespace (one I just introduced and a bunch of
others in the same directory).

r326049:
While the EFI spec allows numbers to be in many forms, libefivar
produces hex numbers for the dsn. Since that come is from EDK2, change
this for symmetry, by generating the dsn as a hex number.

[Missed as part of the efivar/efibootmgr MFCs]

Reported by: Oliver Pinter <oliver.pinter@hardenedbsd.org>

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

sys/geom: spelling fixes in comments.

No functional change.

g_part_bsd64: Delete duplicate/dead code

RAW_PART is handled earlier in the loop.

Reported by: Coverity
CID: 1223201
Sponsored by: EMC / Isilon Storage Division

g_part_bsd64: Check for valid on-disk npartitions value

This value is u32 on disk, but assigned to an int in memory. After we do the
implicit conversion via assignment, check that the result is at least one[1]
(non-negative[2]).

1. The subsequent for-loop iterates from gpt_entries minus one, down, until
reaching zero. A negative or zero initial index results in undefined signed
integer overflow.
2. It is also used to index into arrays later.

In practice, we expected non-malicious disks to contain small positive values.

Reported by: Coverity
CID: 1223202
Sponsored by: EMC / Isilon Storage Division

sys: use our roundup2/rounddown2() macros when param.h is available.

rounddown2 tends to produce longer lines than the original code
and when the code has a high indentation level it was not really
advantageous to do the replacement.

This tries to strike a balance between readability using the macros
and flexibility of having the expressions, so not everything is
converted.

Add disklabel64 support to GEOM_PART class.

This partitioning scheme is used in DragonFlyBSD. It is similar to
BSD disklabel, but has the following improvements:
* metadata has own dedicated place and isn't accessible through partitions;
* all offsets are 64-bit;
* supports 16 partitions by default (has reserved place for more);
* has reserved place for backup label (but not yet implemented);
* has UUIDs for partitions and partition types;

No objections from: geom
MFC after: 2 weeks
Relnotes: yes