bgmac: make bgmac work on systems without nvram

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 drivers/net/ethernet/broadcom/bgmac.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -16,7 +16,11 @@
 #include <linux/phy.h>
 #include <linux/interrupt.h>
 #include <linux/dma-mapping.h>
+#ifdef CONFIG_BCM47XX
 #include <bcm47xx_nvram.h>
+#else
+#define bcm47xx_nvram_getenv(a, b, c) -1
+#endif
 
 static const struct bcma_device_id bgmac_bcma_tbl[] = {
 	BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_4706_MAC_GBIT, BCMA_ANY_REV, BCMA_ANY_CLASS),