add gpiolib support to ucb1x00

The old access methods to the gpios will be removed when
all users has been converted. (mainly ucb1x00-ts)

include/linux/mfd/ucb1x00.h

@@ -11,6 +11,8 @@
 #define UCB1200_H
 
 #include <linux/mfd/mcp.h>
+#include <linux/gpio.h>
+
 #define UCB_IO_DATA	0x00
 #define UCB_IO_DIR	0x01
 
@@ -123,6 +125,7 @@ struct ucb1x00 {
 	struct device		dev;
 	struct list_head	node;
 	struct list_head	devs;
+	struct gpio_chip 	gpio;
 };
 
 struct ucb1x00_driver;