media: atomisp: make array idx_map static const

Don't populate the read-only array idx_map on the stack but
instead it static const. Also makes the object code a little smaller.

Link: https://lore.kernel.org/linux-media/20220109195129.46118-1-colin.i.king@gmail.comSigned-off-by: NColin Ian King <colin.i.king@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/isp/kernels/macc/macc1_5/ia_css_macc1_5.host.c

@@ -44,7 +44,7 @@ ia_css_macc1_5_vmem_encode(
     unsigned int size)
 {
 	unsigned int i, j, k, idx;
-	unsigned int idx_map[] = {
+	static const unsigned int idx_map[] = {
 		0, 1, 3, 2, 6, 7, 5, 4, 12, 13, 15, 14, 10, 11, 9, 8
 	};