arch-arm,cpu: Add four Arm SVE2 int instructions

This changeset adds ARM SVE2 integer instructions
- ADCLB, ADCLT, SBCLB, SBCLT
- Decoding logic as per sve encoding of Version: 2023-03

Change-Id: I1bd3fe24b33677baa0b6da3c1dd7423f2b13b2c6
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/70137
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>