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/soc/intel/common/block/scs/sd.c b/src/soc/intel/common/block/scs/sd.c
index d31e33c..8e44738 100644
--- a/src/soc/intel/common/block/scs/sd.c
+++ b/src/soc/intel/common/block/scs/sd.c
@@ -7,7 +7,7 @@
 #include <intelblocks/sd.h>
 
 #if CONFIG(HAVE_ACPI_TABLES)
-static void sd_fill_ssdt(struct device *dev)
+static void sd_fill_ssdt(const struct device *dev)
 {
 	const char *path;
 	struct acpi_gpio default_gpio = { 0 };