soc: mediatek: pwrap: Constify struct pmic_wrapper_type

'struct pmic_wrapper_type' is not modified in this driver.

Constifying this structure moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  45336	   8724	     16	  54076	   d33c	drivers/soc/mediatek/mtk-pmic-wrap.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  45528	   8532	     16	  54076	   d33c	drivers/soc/mediatek/mtk-pmic-wrap.o
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/5b4b60c5dfd6d8fe893b05cfc96c0e2d67705463.1720331018.git.christophe.jaillet@wanadoo.frSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

drivers/soc/mediatek/mtk-pmic-wrap.c

@@ -2397,7 +2397,7 @@ static const struct pmic_wrapper_type pwrap_mt8183 = {
 	.init_soc_specific = pwrap_mt8183_init_soc_specific,
 };
 
-static struct pmic_wrapper_type pwrap_mt8195 = {
+static const struct pmic_wrapper_type pwrap_mt8195 = {
 	.regs = mt8195_regs,
 	.type = PWRAP_MT8195,
 	.arb_en_all = 0x777f, /* NEED CONFIRM */
@@ -2423,7 +2423,7 @@ static const struct pmic_wrapper_type pwrap_mt8365 = {
 	.init_soc_specific = NULL,
 };
 
-static struct pmic_wrapper_type pwrap_mt8516 = {
+static const struct pmic_wrapper_type pwrap_mt8516 = {
 	.regs = mt8516_regs,
 	.type = PWRAP_MT8516,
 	.arb_en_all = 0xff,
@@ -2435,7 +2435,7 @@ static struct pmic_wrapper_type pwrap_mt8516 = {
 	.init_soc_specific = NULL,
 };
 
-static struct pmic_wrapper_type pwrap_mt8186 = {
+static const struct pmic_wrapper_type pwrap_mt8186 = {
 	.regs = mt8186_regs,
 	.type = PWRAP_MT8186,
 	.arb_en_all = 0xfb27f,