[llvm] [AMDGPU][NFC] Move InstCounterType and Waitcnt to SIInsertWaitcnts.h (PR #187823)

[Matt Arsenault via llvm-commits]

arsenm wrote:

It's true that InstrCounterType and Waitcnt don't belong in AMDGPUBaseInfo. But Passes that aren't SIInsertWaitcnts shouldn't be including files that are named SIInsertWaitcnts. This should probably be named something else, AMDGPUWaitcntUtils?

https://github.com/llvm/llvm-project/pull/187823