drivers: gpio: implement MAX77663 GPIO cell

MAXIM Semiconductor's PMIC, MAX77663 has 8 GPIO pins and 3 GPIO-like
pins. It also supports interrupts from these pins.

Add GPIO driver for these pins to control via GPIO APIs.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

include/dt-bindings/pmic/max77663.h

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ *  Copyright(C) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#ifndef _DT_BINDINGS_MAX77663_H_
+#define _DT_BINDINGS_MAX77663_H_
+
+/*
+ * MAX77663 has 8 GPIO (0 to 7) and 3 KEYS
+ * KEYS are appended after GPIOs
+ */
+
+#define EN0	10
+#define ACOK	9
+#define LID	8
+
+#endif