revert "drm/amdgpu/pm: Implement SDMA queue reset for different asic"

pmfw unified PPSMC_MSG_ResetSDMA definitions for different devices.
PPSMC_MSG_ResetSDMA2 is not needed.

Signed-off-by: Jesse Zhang <jesse.zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>