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>

src/mainboard/google/fizz/mainboard.c

@@ -187,7 +187,7 @@ static void mainboard_init(struct device *dev)
 }
 
 static unsigned long mainboard_write_acpi_tables(
-	struct device *device, unsigned long current, acpi_rsdp_t *rsdp)
+	const struct device *device, unsigned long current, acpi_rsdp_t *rsdp)
 {
 	const char *oem_id = NULL;
 	const char *oem_table_id = NULL;