This patch disables the probing of authenticate ptrauth instruction
(AUTIASP) which falls under the hint instructions region. This is done
to disallow probe of authenticate instruction in the kernel which may
lead to ptrauth faults with the addition of Armv8.6 enhanced ptrauth
features.

The corresponding append pac ptrauth instruction (PACIASP) is not disabled
and they can still be probed.

Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>