[media] drx-j: get rid of drx_driver.c

This file contains just the firmware load code, that it is also
somewhat duplicated at drxj.c.

Move the code into there. Latter patches will remove the
duplicated code.
Acked-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/dvb-frontends/drx39xyj/Makefile

-drx39xyj-objs := drx39xxj.o drx_driver.o drx39xxj_dummy.o drxj.o drx_dap_fasi.o
+drx39xyj-objs := drx39xxj.o drx39xxj_dummy.o drxj.o drx_dap_fasi.o
 
 obj-$(CONFIG_DVB_DRX39XYJ) += drx39xyj.o