When the mode is set with 16bpp on QEMU, the output gets totally broken.
The culprit is the bogus register values set for 16bpp, which was likely
copied from from a wrong place.

Addresses https://bugzilla.novell.com/show_bug.cgi?id=799216Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Cc: David Airlie <airlied@linux.ie>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>