ssb: Export ssb_chipco_gpio_control - needed by N PHY code

The latest changes in the N PHY core require the symbol
ssb_chipco_gpio_control to be exported.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/ssb/driver_chipcommon.c b/drivers/ssb/driver_chipcommon.c
index 9681536..59c3c0f 100644
--- a/drivers/ssb/driver_chipcommon.c
+++ b/drivers/ssb/driver_chipcommon.c
@@ -370,6 +370,7 @@
 {
 	return chipco_write32_masked(cc, SSB_CHIPCO_GPIOCTL, mask, value);
 }
+EXPORT_SYMBOL(ssb_chipco_gpio_control);
 
 u32 ssb_chipco_gpio_intmask(struct ssb_chipcommon *cc, u32 mask, u32 value)
 {