[AArch64] Add the Ampere1B core (#81297)

The Ampere1B is Ampere's third-generation core implementing a
superscalar, out-of-order microarchitecture with nested virtualization,
speculative side-channel mitigation and architectural support for
defense against ROP/JOP style software attacks.

Ampere1B is an ARMv8.7+ implementation, adding support for the FEAT
WFxT, FEAT CSSC, FEAT PAN3 and FEAT AFP extensions. It also includes all
features of the second-generation Ampere1A, such as the Memory Tagging
Extension and SM3/SM4 cryptography instructions.

(cherry picked from commit fbba818a)