[media] drx-j: remove unused code from drx_driver.c

There are several drx-j code there that are never used, as
they don't even fit into Linux DVB subystem model.

Remove them, in order to simplify the code.
Acked-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/dvb-frontends/drx39xyj/drx_driver.h

@@ -2464,10 +2464,6 @@ Access macros
 Exported FUNCTIONS
 -------------------------------------------------------------------------*/
 
-	int drx_init(struct drx_demod_instance *demods[]);
-
-	int drx_term(void);
-
 	int drx_open(struct drx_demod_instance *demod);
 
 	int drx_close(struct drx_demod_instance *demod);