b43: add config for (en|dis)abling G-PHY support

This allows new devices users to save some space.

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.c b/drivers/net/wireless/b43/main.c
index 4164afa..9cf07bb 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -4306,10 +4306,12 @@
 	phy_type = (tmp & B43_PHYVER_TYPE) >> B43_PHYVER_TYPE_SHIFT;
 	phy_rev = (tmp & B43_PHYVER_VERSION);
 	switch (phy_type) {
+#ifdef CONFIG_B43_PHY_G
 	case B43_PHYTYPE_G:
 		if (phy_rev > 9)
 			unsupported = 1;
 		break;
+#endif
 #ifdef CONFIG_B43_PHY_N
 	case B43_PHYTYPE_N:
 		if (phy_rev > 9)