[MCA][RISCV]Enable latency instrument on RISCV (#160063)
Recently added latency customization
([PR](https://github.com/llvm/llvm-project/pull/155420)) does not work
on RISCV since it has target-specific InstrumentManager that overrides
default functionality. Added calls to base class to ensure that common
instruments (including latency customizer) are available.
