net: Fix mcast function pointer prototype

This fixes the following compiler warnings when activating
CONFIG_MCAST_TFTP:

tsec.c: In function 'tsec_mcast_addr':
tsec.c:130:2: warning: passing argument 2 of 'ether_crc' makes pointer
from integer without a cast [enabled by default]
In file included from /work/u-boot-net/include/common.h:874:0,
                 from tsec.c:15:
/work/u-boot-net/include/net.h:189:5: note: expected 'const unsigned
char *' but argument is of type 'u8'
tsec.c: In function 'tsec_initialize':
tsec.c:646:13: warning: assignment from incompatible pointer type
[enabled by default]
eth.c: In function 'eth_mcast_join':
eth.c:358:2: warning: passing argument 2 of 'eth_current->mcast' makes
integer from pointer without a cast [enabled by default]
eth.c:358:2: note: expected 'u32' but argument is of type 'u8 *'

In the eth_mcast_join() implementation, eth_current->mcast()
takes a u8 pointer to the multicast mac address and not a ip
address value as implied by its prototype.

Fix parameter type mismatch for tsec_macst_addr() (tsec.c):
ether_crc() takes a u8 pointer not a u8 value.
mcast() is given a u8 pointer to the multicats mac address.
Update parameter type for the rest of mcast() instances.

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Patch: 278989
diff --git a/include/net.h b/include/net.h
index 5aedc17..0802fad 100644
--- a/include/net.h
+++ b/include/net.h
@@ -89,7 +89,7 @@
 	int  (*recv) (struct eth_device *);
 	void (*halt) (struct eth_device *);
 #ifdef CONFIG_MCAST_TFTP
-	int (*mcast) (struct eth_device *, u32 ip, u8 set);
+	int (*mcast) (struct eth_device *, const u8 *enetaddr, u8 set);
 #endif
 	int  (*write_hwaddr) (struct eth_device *);
 	struct eth_device *next;