drm/modes: parse_cmdline: Add support for specifying panel_orientation (v2)

Sometimes we want to override a connector's panel_orientation from the
kernel commandline. Either for testing and for special cases, e.g. a kiosk
like setup which uses a TV mounted in portrait mode.

Users can already specify a "rotate" option through a video= kernel cmdline
option. But that only supports 0/180 degrees (see drm_client_modeset TODO)
and only works for in kernel modeset clients, not for userspace kms users.

The "panel-orientation" connector property OTOH does support 90/270 degrees
as it leaves dealing with the rotation up to userspace and this does work
for userspace kms clients (at least those which support this property).

Changes in v2:
-Add missing ':' after @panel_orientation (reported by kbuild test robot)

BugLink: https://gitlab.freedesktop.org/plymouth/plymouth/merge_requests/83
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-9-hdegoede@redhat.com

include/drm/drm_connector.h

@@ -1069,6 +1069,14 @@ struct drm_cmdline_mode {
 	 */
 	unsigned int rotation_reflection;
 
+	/**
+	 * @panel_orientation:
+	 *
+	 * drm-connector "panel orientation" property override value,
+	 * DRM_MODE_PANEL_ORIENTATION_UNKNOWN if not set.
+	 */
+	enum drm_panel_orientation panel_orientation;
+
 	/**
 	 * @tv_margins: TV margins to apply to the mode.
 	 */