[media] drx-j: get rid of the bsp*.h headers

Move them into drx_driver.h

That makes easier to cleanup further what's there at the
headers.

Acked-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>