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>

src/arch/x86/acpi_device.c

@@ -941,7 +941,7 @@ struct acpi_dp *acpi_dp_add_gpio(struct acpi_dp *dp, const char *name,
  *    }
  * }
  */
-void acpi_device_write_pci_dev(struct device *dev)
+void acpi_device_write_pci_dev(const struct device *dev)
 {
 	const char *scope = acpi_device_scope(dev);
 	const char *name = acpi_device_name(dev);