drm/amdgpu: Use correct MES pipe in non-SPX mode on GFX 12.1

drm/amdgpu: Use correct MES pipe in non-SPX mode on GFX 12.1

On GFX 12.1, use the correct MES pipe instance for readiness before
sending MES commands on that pipe. Additionally, send the TLB requests
on the correct MES pipe in non-SPX modes.

Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Michael Chen <michael.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>