arm64: Introduce esr_is_ubsan_brk()

Soon, KVM is going to use this logic for hypervisor panics,
so add it in a wrapper that can be used by the hypervisor exit
handler to decode hyp panics.

Signed-off-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Kees Cook <kees@kernel.org>
Link: https://lore.kernel.org/r/20250430162713.1997569-2-smostafa@google.com


Signed-off-by: Marc Zyngier <maz@kernel.org>