media: dvb-frontends/cxd2841er: make several arrays static

Don't populate arrays on the stack but make them static.  Makes
the object code smaller:

Before:
   text	   data	    bss	    dec	    hex	filename
  89299	  21704	     64	 111067	  1b1db	cxd2841er.o

After:
   text	   data	    bss	    dec	    hex	filename
  85823	  23432	     64	 109319	  1ab07	cxd2841er.o

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