cpu/intel/haswell: Constify ACPI c-state arrays

Change-Id: I5538d8279392238e59aba99ade4b5fe13f250ca8
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49805
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/cpu/intel/haswell/acpi.c b/src/cpu/intel/haswell/acpi.c
index dfbda45..8eec704 100644
--- a/src/cpu/intel/haswell/acpi.c
+++ b/src/cpu/intel/haswell/acpi.c
@@ -87,19 +87,19 @@
 	},
 };
 
-static int cstate_set_s0ix[3] = {
+static const int cstate_set_s0ix[3] = {
 	C_STATE_C1E,
 	C_STATE_C7S_LONG_LAT,
 	C_STATE_C10,
 };
 
-static int cstate_set_lp[3] = {
+static const int cstate_set_lp[3] = {
 	C_STATE_C1E,
 	C_STATE_C3,
 	C_STATE_C7S_LONG_LAT,
 };
 
-static int cstate_set_trad[3] = {
+static const int cstate_set_trad[3] = {
 	C_STATE_C1,
 	C_STATE_C3,
 	C_STATE_C6_LONG_LAT,
@@ -182,7 +182,7 @@
 {
 	acpi_cstate_t acpi_cstate_map[3] = {0};
 
-	int *acpi_cstates;
+	const int *acpi_cstates;
 
 	if (is_s0ix_enabled())
 		acpi_cstates = cstate_set_s0ix;