drm/radeon: add DisplayPort MST support (v2)

This adds initial DP 1.2 MST support to radeon, on CAYMAN
and up in theory.

This is off by default.

v2: agd5f:
- add UNIPHY3 offsets
- move atom cmd table code into atombios_encoders.c
- whitespace cleanup
- replace some magic numbers with proper defines

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

diff --cc drivers/gpu/drm/radeon/Makefile
Simple merge

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

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

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

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

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

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

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

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

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