gpio: adp5585: add gpio driver for ADP5585 I/O Expander Controller

Add gpio driver for ADP5585 I/O Expander Controller. The ADP5585 is a 10
input/output port expander and can be used to increase the number of
I/Os available to a processor.

Signed-off-by: Alice Guo <alice.guo@nxp.com>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 2a60478..220e2cb 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -611,4 +611,10 @@
 	help
 	   Support for GPIOs on Faraday Technology's FTGPIO010 controller.
 
+config ADP5585_GPIO
+	bool "ADP5585 GPIO driver"
+	depends on DM_GPIO && DM_I2C
+	help
+	  Support ADP5585 GPIO expander.
+
 endif