media: drxd: make const array fastIncrDecLUT static

Don't populate array fastIncrDecLUT on the stack but instead make it
static. Makes the object code smaller by over 360 bytes:

   text	   data	    bss	    dec	    hex	filename
  32680	    944	     64	  33688	   8398	drxd_hard.o

   text	   data	    bss	    dec	    hex	filename
  32223	   1040	     64	  33327	   822f	drxd_hard.o

(gcc version 7.2.0 x86_64)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/drxd_hard.c

@@ -640,7 +640,7 @@ static int SetCfgIfAgc(struct drxd_state *state, struct SCfgAgc *cfg)
 				const u16 maxRur = 8;
 				static const u16 slowIncrDecLUT[] = {
 					3, 4, 4, 5, 6 };
-				const u16 fastIncrDecLUT[] = {
+				static const u16 fastIncrDecLUT[] = {
 					14, 15, 15, 16,
 					17, 18, 18, 19,
 					20, 21, 22, 23,