allwinner: Constify data structures

This maximizes the amount of data protected by the MMU.
Signed-off-by: Samuel Holland <samuel@sholland.org>

plat/allwinner/common/sunxi_common.c

@@ -18,7 +18,7 @@
 #include <sunxi_mmap.h>
 #include <sunxi_private.h>
 
-static mmap_region_t sunxi_mmap[PLATFORM_MMAP_REGIONS + 1] = {
+static const mmap_region_t sunxi_mmap[PLATFORM_MMAP_REGIONS + 1] = {
 	MAP_REGION_FLAT(SUNXI_SRAM_BASE, SUNXI_SRAM_SIZE,
 			MT_MEMORY | MT_RW | MT_SECURE),
 	MAP_REGION_FLAT(SUNXI_DEV_BASE, SUNXI_DEV_SIZE,

plat/allwinner/common/sunxi_topology.c

@@ -9,7 +9,7 @@
 #include <arch.h>
 #include <plat/common/platform.h>
 
-static unsigned char plat_power_domain_tree_desc[PLAT_MAX_PWR_LVL + 1] = {
+static const unsigned char plat_power_domain_tree_desc[PLAT_MAX_PWR_LVL + 1] = {
 	/* One root node for the SoC */
 	1,
 	/* One node for each cluster */

plat/allwinner/sun50i_a64/sunxi_power.c

@@ -175,7 +175,7 @@ static int fdt_get_regulator_millivolt(const void *fdt, int node)
 
 #define NO_SPLIT 0xff
 
-struct axp_regulator {
+static const struct axp_regulator {
 	char *dt_name;
 	uint16_t min_volt;
 	uint16_t max_volt;
@@ -247,7 +247,7 @@ static void setup_axp803_rails(const void *fdt)
 	for (node = fdt_first_subnode(fdt, node);
 	     node != -FDT_ERR_NOTFOUND;
 	     node = fdt_next_subnode(fdt, node)) {
-		struct axp_regulator *reg;
+		const struct axp_regulator *reg;
 		const char *name;
 		int length;