drm/amd/powerplay: replace SMU_MSG_XXX with PPSMC_MSG_XXX message index for smu11 (v2)

This patch is to setup a common SMU_MSGs for smu11. We can support common MSG
definitions for each asics under smu11.

v2: move smu_v11_0_ppsmc.h to xxx_ppt.c level, because it depends on specific
asic.

Signed-off-by: Kevin Wang <Kevin1.Wang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>