media: staging: stkwebcam: Restore MEDIA_{USB,CAMERA}_SUPPORT dependencies

By moving support for the USB Syntek DC1125 Camera to staging, the
dependencies on MEDIA_USB_SUPPORT and MEDIA_CAMERA_SUPPORT were lost.

Fixes: 56280c64 ("media: stkwebcam: deprecate driver, move to staging")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>