drm/radeon: add runtime PM support (v2)

This hooks radeon up to the runtime PM system to enable
dynamic power management for secondary GPUs in switchable
and powerxpress laptops.

v2: agd5f: clean up, add module parameter

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

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

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

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

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

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

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

diff --cc drivers/gpu/drm/radeon/radeon_ioc32.c
Simple merge

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

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