microblaze: Use static const char * const where possible

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/kernel/heartbeat.c

@@ -47,7 +47,7 @@ void setup_heartbeat(void)
 	struct device_node *gpio = NULL;
 	int *prop;
 	int j;
-	char *gpio_list[] = {
+	const char * const gpio_list[] = {
 		"xlnx,xps-gpio-1.00.a",
 		"xlnx,opb-gpio-1.00.a",
 		NULL

arch/microblaze/kernel/intc.c

@@ -126,7 +126,7 @@ void __init init_IRQ(void)
 				0
 			};
 #endif
-	static char *intc_list[] = {
+	const char * const intc_list[] = {
 				"xlnx,xps-intc-1.00.a",
 				"xlnx,opb-intc-1.00.c",
 				"xlnx,opb-intc-1.00.b",

arch/microblaze/kernel/timer.c

@@ -258,7 +258,7 @@ void __init time_init(void)
 				0
 			};
 #endif
-	char *timer_list[] = {
+	const char * const timer_list[] = {
 		"xlnx,xps-timer-1.00.a",
 		"xlnx,opb-timer-1.00.b",
 		"xlnx,opb-timer-1.00.a",