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/Makefile b/drivers/gpio/Makefile
index eee7908..7235714 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -76,3 +76,4 @@
 obj-$(CONFIG_SLG7XL45106_I2C_GPO)	+= gpio_slg7xl45106.o
 obj-$(CONFIG_$(SPL_TPL_)TURRIS_OMNIA_MCU)	+= turris_omnia_mcu.o
 obj-$(CONFIG_FTGPIO010)		+= ftgpio010.o
+obj-$(CONFIG_ADP5585_GPIO)	+= adp5585_gpio.o