media: solo6x10: make const array saa7128_regs_ntsc static

Don't populate const array saa7128_regs_ntsc on the stack but insteaed make
it static.  Makes the object code smaller and saves nearly 840 bytes

Before:
   text	   data	    bss	    dec	    hex	filename
   9218	    360	      0	   9578	   256a	solo6x10-tw28.o

After:
   text	   data	    bss	    dec	    hex	filename
   8237	    504	      0	   8741	   2225	solo6x10-tw28.o

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Andrey Utkin <andrey_utkin@fastmail.com>
Signed-off-by: Ismael Luceno <ismael@iodev.co.uk>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>