gma500: Add Oaktrail support

Oaktrail (GMA600) is found on some tablet/slate PC type systems. It's a bit
different to the GMA500 but similar enough it makes sense to plug it into
the same driver.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --cc drivers/gpu/drm/gma500/oaktrail.h
Simple merge

diff --cc drivers/gpu/drm/gma500/oaktrail_crtc.c
Simple merge

diff --cc drivers/gpu/drm/gma500/oaktrail_device.c
Simple merge

diff --cc drivers/gpu/drm/gma500/oaktrail_hdmi.c
Simple merge

diff --cc drivers/gpu/drm/gma500/oaktrail_hdmi_i2c.c
Simple merge

diff --cc drivers/gpu/drm/gma500/oaktrail_lvds.c
Simple merge