add gpiolib support to ucb1x00

The old access methods to the gpios will be removed when
all users has been converted. (mainly ucb1x00-ts)
diff --git a/include/linux/mfd/mcp.h b/include/linux/mfd/mcp.h
index be95e09..ee496708 100644
--- a/include/linux/mfd/mcp.h
+++ b/include/linux/mfd/mcp.h
@@ -26,6 +26,7 @@
 	dma_device_t	dma_telco_rd;
 	dma_device_t	dma_telco_wr;
 	struct device	attached_device;
+	int		gpio_base;
 };
 
 struct mcp_ops {