arm64: standardise cpucap bitmap names

arm64: standardise cpucap bitmap names

The 'cpu_hwcaps' and 'boot_capabilities' bitmaps are bitmaps have the
same enumerated bits, but are named wildly differently for no good
reason. The terms 'hwcaps' and 'capabilities' have become ambiguous over
time (e.g. due to clashes with ELF hwcaps and the structures used to
manage feature detection), and it would be nicer to use 'cpucaps',
matching the <asm/cpucaps.h> header the enumerated bit indices are
defined in.

While this isn't a functional problem, it makes the code harder than
necessary to understand, and hard to extend with related functionality
(e.g. per-cpu cpucap bitmaps).

To that end, this patch renames `boot_capabilities` to `boot_cpucaps`
and `cpu_hwcaps` to `system_cpucaps`. This more clearly indicates the
relationship between the two and aligns with terminology used elsewhere
in our feature management code.

This change was scripted with:

| find . -type f -name '*.[chS]' -print0 | \
|   xargs -0 sed -i 's/\<boot_capabilities\>/boot_cpucaps/'
| find . -type f -name '*.[chS]' -print0 | \
|   xargs -0 sed -i 's/\<cpu_hwcaps\>/system_cpucaps/'

... and the instance of "cpu_hwcap" (without a trailing "s") in
<asm/mmu_context.h> corrected manually to "system_cpucaps".

Subsequent patches will adjust the naming of related functions to better
align with the `cpucap` naming.

There should be no functional change as a result of this patch; this is
purely a renaming exercise.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20230607164846.3967305-2-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>