replacing all ifndef with pargma once

All the kernel header files now use pargma once rather than the ifndef,
as the pre-processed C files do not change while header files
are protected with pargma once. This will also solve any naming issues
caused by ifndef.

Convert license tags to SPDX identifiers

This commit also converts our own copyright headers to directly use
SPDX, but leaves all other copyright header intact, only adding the
SPDX ident. As far as possible this commit also merges multiple
Data61 copyright statements/headers into one for consistency.

style: consistently align pointer with name

Run astyle with align-pointer=name

arm: Change TTBR0/1 read/write function names.

The following functions, readTTBR0, writeTTBR0, readTTBR1, and
writeTTBR1, write and return raw TTBR0/1 values.
The function writeTTBR0Ptr is added for used in context swtich
functions, and it modify the input physical address before
writing the TTBR0. Places using these functions are also
updated.

ARM: Add 32 bit directory for armv8-a

Remove many MODIFIES annotations.

These are redundant for any function which the C-to-Isabelle parser
actually analyses, which is now the vast majority of functions.

arm_hyp: Move hype state into correct statedata header

The hypervisor state is declared in arch/32/statedata.c, but is
defined in arch/statedata.h. This commit moves the definitions to
arch/32/statedata.h to match all the other state in arch/32/statedata.c

SELFOUR-632: implement cores non-architecture dependent structres

arm-hyp: Minor cleanups

Cleanup some small licensing, whitespace and configuration details

arm_hyp: rm ARM_HYP ifdefs; func inline assembly

vcpu.c:
encapsulate inline assembly into inline functions that added to
device_pl2.h file.

other files:
replace #ifdef ARM_HYP with config_set(ARM_HYP)

arm_hyp: rm ARM_HYP ifdefs; func inline assembly

vcpu.c:
encapsulate inline assembly into inline functions that added to
device_pl2.h file.

other files:
replace #ifdef ARM_HYP with config_set(ARM_HYP)

arm: Rearrange context switching code to make fastpath and regular code not duplicate functionality

Release snapshot