[AMD][AITER] Add more AMD kernels

[xuzhao9]

• FMHA: https://github.com/ROCm/aiter/blob/355_wip/aiter/ops/triton/mha.py
• RMS_NORM: https://github.com/meta-pytorch/tritonbench/blob/main/tritonbench/operators/rms_norm/operator.py#L154
• ROPE: https://github.com/ROCm/aiter/blob/main/op_tests/op_benchmarks/triton/bench_rope.py