KVM: arm64: Unify UNDEF injection helpers

We currently have two helpers (undef_access() and trap_undef()) that
do exactly the same thing: inject an UNDEF and return 'false' (as an
indication that PC should not be incremented).

We definitely could do with one less. Given that undef_access() is
used 80ish times, while trap_undef() is only used 30 times, the
latter loses the battle and is immediately sacrificed.

We also have a large number of instances where undef_access() is
open-coded. Let's also convert those.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240827152517.3909653-11-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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