device: Constify struct device * parameter to acpi_fill_ssdt()

.acpi_fill_ssdt() does not need to modify the device structure. This
change makes the struct device * parameter to acpi_fill_ssdt() as
const.

Change-Id: I110f4c67c3b6671c9ac0a82e02609902a8ee5d5c
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40710
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/southbridge/intel/ibexpeak/lpc.c b/src/southbridge/intel/ibexpeak/lpc.c
index 395919e..242d274 100644
--- a/src/southbridge/intel/ibexpeak/lpc.c
+++ b/src/southbridge/intel/ibexpeak/lpc.c
@@ -716,7 +716,7 @@
 	return "LPCB";
 }
 
-static void southbridge_fill_ssdt(struct device *device)
+static void southbridge_fill_ssdt(const struct device *device)
 {
 	struct device *dev = pcidev_on_root(0x1f, 0);
 	config_t *chip = dev->chip_info;
diff --git a/src/southbridge/intel/ibexpeak/sata.c b/src/southbridge/intel/ibexpeak/sata.c
index 3a7bdb6..11ac078 100644
--- a/src/southbridge/intel/ibexpeak/sata.c
+++ b/src/southbridge/intel/ibexpeak/sata.c
@@ -212,7 +212,7 @@
 	pci_write_config16(dev, 0x90, map);
 }
 
-static void sata_fill_ssdt(struct device *dev)
+static void sata_fill_ssdt(const struct device *dev)
 {
 	config_t *config = dev->chip_info;
 	generate_sata_ssdt_ports("\\_SB_.PCI0.SATA", config->sata_port_map);