Add SimdMatMultAcc and SimdFloatMatMultAcc Op Classes for the SVE Matrix Multiply Accumulate instructions in the SVE F32MM, F64MM and I8MM extensions. Initial latencies have been set to be the same as SimdMultAcc and SimdFloatMultAcc respectively. Change-Id: Ifab63a0efbb0ccfbd272245e0b0b055279f66e3a Reviewed-by: Richard Cooper <richard.cooper@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/70734 Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>