drm/radeon/kms: remove r6xx+ blit copy routines

No longer used now that we use the async dma engines or
CP DMA for bo copies.

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

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

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

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

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

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

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

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

diff --cc drivers/gpu/drm/radeon/r600_blit.c
Simple merge

diff --cc drivers/gpu/drm/radeon/r600_blit_kms.c
Simple merge

diff --cc drivers/gpu/drm/radeon/r600_blit_shaders.h
Simple merge

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

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

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

diff --cc drivers/gpu/drm/radeon/rv770.c
Simple merge