drm/bridge: Add interlace_allowed flag to drm_bridge

In preparation for a connector creation helper based on a chain of
bridges, add a flag to the drm_bridge structure to report support for
interlaced modes. This will be used to set the connector's
interlace_allowed flag.

Signed-off-by: Laurent Pinchart <[e-mail]>
Tested-by: Sebastian Reichel <[e-mail]>
Reviewed-by: Sebastian Reichel <[e-mail]>
Signed-off-by: Tomi Valkeinen <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

include/drm/drm_bridge.h

···
 	 */
 	int type;
 	/**
+	 * @interlace_allowed: Indicate that the bridge can handle interlaced
+	 * modes.
+	 */
+	bool interlace_allowed;
+	/**
 	 * @ddc: Associated I2C adapter for DDC access, if any.
 	 */
 	struct i2c_adapter *ddc;