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/Makefile b/drivers/gpio/Makefile
index 26f2574..ba18594 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -6,6 +6,7 @@
 #
 
 ifndef CONFIG_SPL_BUILD
+obj-$(CONFIG_DWAPB_GPIO)	+= dwapb_gpio.o
 obj-$(CONFIG_AXP_GPIO)		+= axp_gpio.o
 endif
 obj-$(CONFIG_DM_GPIO)		+= gpio-uclass.o