drm/radeon/kms: add dpm support for evergreen (v4)

This adds dpm support for evergreen asics.  This includes:
- clockgating
- dynamic engine clock scaling
- dynamic memory clock scaling
- dynamic voltage scaling
- dynamic pcie gen1/gen2 switching (requires additional acpi support)

Set radeon.dpm=1 to enable.

v2: reduce stack usage, rename ulv struct
v3: fix thermal interrupt check notices by Jerome
v4: fix state enable

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

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

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

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

diff --cc drivers/gpu/drm/radeon/r600.c
Simple merge

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

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

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

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

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

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