media: v4l2-async: Remove V4L2_ASYNC_MATCH_DEVNAME

The last user for this type of match was the soc-camera/sh_mobile_csi2
driver, which was removed in v4.9. If the support is ever needed,
it can always be restored.

[Sakari Ailus: Also drop DEVNAME from debug prints recently added.]

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>