[AArch64][SME2] Add multi-vector saturating doubling multiply high intrinsics

Adds intrinsics for the following SME2 instructions:
 - sqdmulh, 2 vector (single & multi)
 - sqdmulh, 4 vector (single & multi)

NOTE: These intrinsics are still in development and are subject to future changes.

Reviewed By: david-arm

Differential Revision: https://reviews.llvm.org/D142368