device: Constify struct device * parameter to write_acpi_tables

.write_acpi_tables() should not be updating the device structure. This
change makes the struct device * argument to it as const.

Change-Id: I50d013e83a404e0a0e3837ca16fa75c7eaa0e14a
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40701
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
diff --git a/src/northbridge/intel/sandybridge/acpi.c b/src/northbridge/intel/sandybridge/acpi.c
index 9fd13e6..77aa8149 100644
--- a/src/northbridge/intel/sandybridge/acpi.c
+++ b/src/northbridge/intel/sandybridge/acpi.c
@@ -108,7 +108,8 @@
 	return current;
 }
 
-unsigned long northbridge_write_acpi_tables(struct device *const dev, unsigned long current,
+unsigned long northbridge_write_acpi_tables(const struct device *const dev,
+					    unsigned long current,
 					    struct acpi_rsdp *const rsdp)
 {
 	const u32 capid0_a = pci_read_config32(dev, CAPID0_A);