[media] pwc: Remove dead snapshot code
The in kernel version of the pwc driver has never supported snapshot mode, and now that we no longer support the pixfmt.priv abuse there also no longer is a way for userspace to request it, rendering all the code in question dead (never called), so remove it. Signed-off-by: NHans de Goede <hdegoede@redhat.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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