drm/radeon: add dpm UVD handling for evergreen/btc asics

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --cc drivers/gpu/drm/radeon/btc_dpm.c
Simple merge

diff --cc drivers/gpu/drm/radeon/btc_dpm.h
Simple merge

diff --cc drivers/gpu/drm/radeon/cypress_dpm.c
Simple merge

diff --cc drivers/gpu/drm/radeon/cypress_dpm.h
Simple merge

diff --cc drivers/gpu/drm/radeon/rv770_dpm.c
Simple merge

diff --cc drivers/gpu/drm/radeon/rv770_dpm.h
Simple merge

diff --cc drivers/gpu/drm/radeon/rv770_smc.h
Simple merge