[media] radio-si470x: de-emphasis should be set if requested by module parameter

instead of always setting de-emphasis.

Reported-by: Tobias Lorenz <[e-mail]>
Signed-off-by: Joonyoung Shim <[e-mail]>
Acked-by: Tobias Lorenz <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/radio/si470x/radio-si470x-common.c

···
 		goto done;
 
 	/* sysconfig 1 */
-	radio->registers[SYSCONFIG1] = SYSCONFIG1_DE;
+	radio->registers[SYSCONFIG1] =
+		(de << 11) & SYSCONFIG1_DE;		/* DE*/
 	retval = si470x_set_register(radio, SYSCONFIG1);
 	if (retval < 0)
 		goto done;