pmdomain: amlogic: Constify struct meson_secure_pwrc_domain_data

'struct meson_secure_pwrc_domain_data' are not modified in these drivers.

Constifying these structures moves some data to a read-only section, so
increases overall security.

On a x86_64, with allmodconfig:
Before:
======
text data bss dec hex filename
9248 408 0 9656 25b8 drivers/pmdomain/amlogic/meson-secure-pwrc.o

After:
=====
text data bss dec hex filename
9344 304 0 9648 25b0 drivers/pmdomain/amlogic/meson-secure-pwrc.o

Signed-off-by: Christophe JAILLET <[e-mail]>
Link: https://lore.kernel.org/r/e71abd8d75[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/pmdomain/amlogic/meson-secure-pwrc.c

···
 	return of_genpd_add_provider_onecell(pdev->dev.of_node, &pwrc->xlate);
 }
 
-static struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
+static const struct meson_secure_pwrc_domain_data meson_secure_a1_pwrc_data = {
 	.domains = a1_pwrc_domains,
 	.count = ARRAY_SIZE(a1_pwrc_domains),
 };
 
-static struct meson_secure_pwrc_domain_data amlogic_secure_a4_pwrc_data = {
+static const struct meson_secure_pwrc_domain_data amlogic_secure_a4_pwrc_data = {
 	.domains = a4_pwrc_domains,
 	.count = ARRAY_SIZE(a4_pwrc_domains),
 };
 
-static struct meson_secure_pwrc_domain_data amlogic_secure_a5_pwrc_data = {
+static const struct meson_secure_pwrc_domain_data amlogic_secure_a5_pwrc_data = {
 	.domains = a5_pwrc_domains,
 	.count = ARRAY_SIZE(a5_pwrc_domains),
 };
 
-static struct meson_secure_pwrc_domain_data amlogic_secure_c3_pwrc_data = {
+static const struct meson_secure_pwrc_domain_data amlogic_secure_c3_pwrc_data = {
 	.domains = c3_pwrc_domains,
 	.count = ARRAY_SIZE(c3_pwrc_domains),
 };
 
-static struct meson_secure_pwrc_domain_data meson_secure_s4_pwrc_data = {
+static const struct meson_secure_pwrc_domain_data meson_secure_s4_pwrc_data = {
 	.domains = s4_pwrc_domains,
 	.count = ARRAY_SIZE(s4_pwrc_domains),
 };
 
-static struct meson_secure_pwrc_domain_data amlogic_secure_t7_pwrc_data = {
+static const struct meson_secure_pwrc_domain_data amlogic_secure_t7_pwrc_data = {
 	.domains = t7_pwrc_domains,
 	.count = ARRAY_SIZE(t7_pwrc_domains),
 };