[media] as102: Move ancillary routines to the beggining

Avoid having function prototypes by moving some
ancillary routines to the beginning of the file.

No functional changes.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --cc drivers/media/usb/as102/as102_drv.c
Simple merge

diff --cc drivers/media/usb/as102/as102_drv.h
Simple merge

diff --cc drivers/media/usb/as102/as102_fe.c
Simple merge