feat(cpufeat): deny AArch64-only features when building for AArch32

Many newer architecture features are defined for AArch64 only, so cannot
be used in an AArch32 build.

To avoid #ifdef-ing every single user, just provide trivial
implementations of the feature check functions is_feat_xxx_supported(),
which always return "false" in AArch32. The compiler will then optimise
out the dependent code automatically.

Change-Id: I1e7d653fca0e676a11858efd953c2d623f2d5c9e
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
1 file changed