[media] media/video: add I2C dependencies

Davinci VIDEO_VPFE_CAPTURE depends on I2C, so reflect that
in Kconfig to avoid build failures in random configurations.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>