The KMS 'panel orientation' property allows the driver to statically
declare a fixed rotation of an output device. Now that weston_head has a
transform member, plumb the KMS property through to weston_head so the
compositor can make a smarter choice out of the box.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
[daniels: Extracted from one of Lucas's patches]
Signed-off-by: Daniel Stone <daniels@collabora.com>