gen_init_cpio: add static const qualifiers

Add 'const' to constant arrays. I also added missing 'static'.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>

usr/gen_init_cpio.c

@@ -188,7 +188,7 @@ struct generic_type {
 	mode_t mode;
 };
 
-static struct generic_type generic_type_table[] = {
+static const struct generic_type generic_type_table[] = {
 	[GT_DIR] = {
 		.type = "dir",
 		.mode = S_IFDIR
@@ -491,7 +491,7 @@ static void usage(const char *prog)
 		prog);
 }
 
-struct file_handler file_handler_table[] = {
+static const struct file_handler file_handler_table[] = {
 	{
 		.type    = "file",
 		.handler = cpio_mkfile_line,