[ARM] arm32ve: Add UNDEF, PABT, and DABT exception injection

Sooner or later we would be having HVC or SMC based PSCI interface
shared by arm32ve and arm64.

The common PSCI interface emulation would require arm32ve specific
and arm64 specific exception injection mechanisms.

This patch adds helper APIs for injecting undefined, prefetch abort
and data abort exceptions.

Signed-off-by: Anup Patel <anup@brainfault.org>