[SUNGEM]: Use CONFIG_PPC_PMAC throughout.

Fixes some build failures ala bugme bugzilla #3706
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sungem.c

@@ -2681,7 +2681,7 @@ static int gem_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	return rc;
 }
 
-#if (!defined(__sparc__) && !defined(CONFIG_PPC))
+#if (!defined(__sparc__) && !defined(CONFIG_PPC_PMAC))
 /* Fetch MAC address from vital product data of PCI ROM. */
 static void find_eth_addr_in_vpd(void __iomem *rom_base, int len, unsigned char *dev_addr)
 {