x86: apl: Use const for driver operations

Update these declarations to const to ensure that the data ends up in the
rodata section.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/apollolake/pmc.c

@@ -205,7 +205,7 @@ static int apl_pmc_probe(struct udevice *dev)
 	return 0;
 }
 
-static struct acpi_pmc_ops apl_pmc_ops = {
+static const struct acpi_pmc_ops apl_pmc_ops = {
 	.init			= apl_pmc_fill_power_state,
 	.prev_sleep_state	= apl_prev_sleep_state,
 	.disable_tco		= apl_disable_tco,

arch/x86/cpu/intel_common/p2sb.c

@@ -180,7 +180,7 @@ static int p2sb_child_post_bind(struct udevice *dev)
 	return 0;
 }
 
-struct p2sb_ops p2sb_ops = {
+static const struct p2sb_ops p2sb_ops = {
 	.set_hide	= intel_p2sb_set_hide,
 };