drm/ast: initial DP501 support (v0.2)

This is the initial attempt at porting the DP501 code from the userspace
driver,

the firmware file is in
http://people.freedesktop.org/~airlied/ast_dp501_fw.bin

this should really be exposed as another encoder/connector that is cloneable

v0.2:
init 3rd tx properly,
add scratch reduction of VRAM size
backup firmware properly.

Signed-off-by: Dave Airlie <airlied@redhat.com>

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

diff --cc drivers/gpu/drm/ast/ast_dp501.c
Simple merge

diff --cc drivers/gpu/drm/ast/ast_drv.h
Simple merge

diff --cc drivers/gpu/drm/ast/ast_main.c
Simple merge

diff --cc drivers/gpu/drm/ast/ast_mode.c
Simple merge

diff --cc drivers/gpu/drm/ast/ast_post.c
Simple merge