media: v4l2-core: introduce a helper to unregister a spi subdev
Introduce a new video4linux2 spi helper, to unregister a subdev. This allows to get rid of some more ifdefs. Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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