MIPS: AR7: constify some arrays in gpio and prom code

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2980/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ar7/gpio.c

@@ -217,7 +217,7 @@ struct titan_gpio_cfg {
 	u32 func;
 };
 
-static struct titan_gpio_cfg titan_gpio_table[] = {
+static const struct titan_gpio_cfg titan_gpio_table[] = {
 	/* reg, start bit, mux value */
 	{4, 24, 1},
 	{4, 26, 1},

arch/mips/ar7/prom.c

@@ -69,7 +69,7 @@ struct psbl_rec {
 	u32	ffs_size;
 };
 
-static __initdata char psp_env_version[] = "TIENV0.8";
+static const char psp_env_version[] __initconst = "TIENV0.8";
 
 struct psp_env_chunk {
 	u8	num;
@@ -84,7 +84,7 @@ struct psp_var_map_entry {
 	char	*value;
 };
 
-static struct psp_var_map_entry psp_var_map[] = {
+static const struct psp_var_map_entry psp_var_map[] = {
 	{  1,	"cpufrequency" },
 	{  2,	"memsize" },
 	{  3,	"flashsize" },