b43: move MAC PHY clock controling function

This is not N-PHY specific function, we partially duplicate code.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/main.h b/drivers/net/wireless/b43/main.h
index 40db036..a0d327f 100644
--- a/drivers/net/wireless/b43/main.h
+++ b/drivers/net/wireless/b43/main.h
@@ -133,6 +133,7 @@
 
 void b43_mac_suspend(struct b43_wldev *dev);
 void b43_mac_enable(struct b43_wldev *dev);
+void b43_mac_phy_clock_set(struct b43_wldev *dev, bool on);
 
 
 struct b43_request_fw_context;