lpc32xx: add GPIO support

This driver only supports Driver Model, not legacy model.

Signed-off-by: Albert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b609e73..7b5178a 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -7,3 +7,10 @@
 	  the GPIO uclass. Drivers provide methods to query the
 	  particular GPIOs that they provide. The uclass interface
 	  is defined in include/asm-generic/gpio.h.
+
+config LPC32XX_GPIO
+	bool "LPC32XX GPIO driver"
+	depends on DM
+	default n
+	help
+	  Support for the LPC32XX GPIO driver.