mb/google/rex: Create deku variant

BUG=b:305793886
TEST=util/abuild/abuild -p none -t google/rex -x -a -b deku
built without errors.

Signed-off-by: Eran Mitrani <mitrani@google.com>
Change-Id: I332e404e82a7980bb8ed1fb084fe957f526f81d1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78393
Reviewed-by: YH Lin <yueherngl@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <czapiga@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
diff --git a/src/mainboard/google/rex/variants/deku/gpio.c b/src/mainboard/google/rex/variants/deku/gpio.c
new file mode 100644
index 0000000..b6e346f
--- /dev/null
+++ b/src/mainboard/google/rex/variants/deku/gpio.c
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+#include <types.h>
+#include <soc/gpio.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+
+const struct pad_config *variant_gpio_table(size_t *num)
+{
+	*num = 0;
+	return NULL;
+}
+
+const struct pad_config *variant_early_gpio_table(size_t *num)
+{
+	*num = 0;
+	return NULL;
+}
+
+static const struct cros_gpio cros_gpios[] = {
+};
+
+DECLARE_CROS_GPIOS(cros_gpios);
+
+const struct pad_config *variant_romstage_gpio_table(size_t *num)
+{
+	*num = 0;
+	return NULL;
+}