bgmac: fix "cmdcfg" calls for promisc and loopback modes

The last (bool) parameter in bgmac_cmdcfg_maskset says if the write
should be made, even if value didn't change. Currently driver doesn't
match the specs about (not) forcing some changes. This makes it follow
them.
Reported-by: NNathan Hintz <nlhintz@hotmail.com>
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bgmac.c

@@ -776,9 +776,9 @@ static void bgmac_set_rx_mode(struct net_device *net_dev)
 	struct bgmac *bgmac = netdev_priv(net_dev);
 
 	if (net_dev->flags & IFF_PROMISC)
-		bgmac_cmdcfg_maskset(bgmac, ~0, BGMAC_CMDCFG_PROM, false);
+		bgmac_cmdcfg_maskset(bgmac, ~0, BGMAC_CMDCFG_PROM, true);
 	else
-		bgmac_cmdcfg_maskset(bgmac, ~BGMAC_CMDCFG_PROM, 0, false);
+		bgmac_cmdcfg_maskset(bgmac, ~BGMAC_CMDCFG_PROM, 0, true);
 }
 
 #if 0 /* We don't use that regs yet */
@@ -1039,9 +1039,9 @@ static void bgmac_chip_init(struct bgmac *bgmac, bool full_init)
 	bgmac_write_mac_address(bgmac, bgmac->net_dev->dev_addr);
 
 	if (bgmac->loopback)
-		bgmac_cmdcfg_maskset(bgmac, ~0, BGMAC_CMDCFG_ML, true);
+		bgmac_cmdcfg_maskset(bgmac, ~0, BGMAC_CMDCFG_ML, false);
 	else
-		bgmac_cmdcfg_maskset(bgmac, ~BGMAC_CMDCFG_ML, 0, true);
+		bgmac_cmdcfg_maskset(bgmac, ~BGMAC_CMDCFG_ML, 0, false);
 
 	bgmac_write(bgmac, BGMAC_RXMAX_LENGTH, 32 + ETHER_MAX_LEN);