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/drivers/mfd/mcp-sa11x0.c b/drivers/mfd/mcp-sa11x0.c
index 2121898..2584272 100644
--- a/drivers/mfd/mcp-sa11x0.c
+++ b/drivers/mfd/mcp-sa11x0.c
@@ -163,6 +163,7 @@
 	mcp->dma_audio_wr	= DMA_Ser4MCP0Wr;
 	mcp->dma_telco_rd	= DMA_Ser4MCP1Rd;
 	mcp->dma_telco_wr	= DMA_Ser4MCP1Wr;
+	mcp->gpio_base		= data->gpio_base;
 
 	platform_set_drvdata(pdev, mcp);