Add variable resolution support to gspca by allowing subdrivers to
specify try_fmt and enum_framesizes functions.
Signed-off-by: NOndrej Zary <linux@rainbow-software.org>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>