gpio: Add DW APB GPIO driver

Add driver for the DesignWare APB GPIO IP block.
This driver is DM capable and probes from DT.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 5934597..9a5d29d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -14,6 +14,13 @@
 	  particular GPIOs that they provide. The uclass interface
 	  is defined in include/asm-generic/gpio.h.
 
+config DWAPB_GPIO
+	bool "DWAPB GPIO driver"
+	depends on DM && DM_GPIO
+	default n
+	help
+	  Support for the Designware APB GPIO driver.
+
 config LPC32XX_GPIO
 	bool "LPC32XX GPIO driver"
 	depends on DM