drm/radeon/dp: switch to the common i2c over aux code

Provides a nice cleanup in radeon.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>

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

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

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

diff --cc drivers/gpu/drm/radeon/radeon_i2c.c
Simple merge

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