media: uvcvideo: move uvc_format_desc to common header

The uvc_format_desc, GUID defines and the uvc_format_by_guid helper is
also useful for the uvc gadget stack. This patch moves them to a common
header.

Tested-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20220909221335.15033-3-m.grzeschik@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>