via-velocity: don't annotate MAC registers as packed

On ARM, memory accesses through packed pointers behave in unexpected
ways in GCC releases 4.3 and higher; see https://lkml.org/lkml/2011/2/2/163
for discussion.

In this particular case, 32-bit I/O registers are accessed bytewise,
causing incorrect setting of the DMA address registers which in turn
leads to an error interrupt storm that brings the system to a halt.

Since the mac_regs structure does not need any packing anyway, this patch
simply removes the attribute to fix the issue.
Signed-off-by: NUlrich Hecht <uli@suse.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/via-velocity.h

@@ -1096,7 +1096,7 @@ struct mac_regs {
 
 	volatile __le16 PatternCRC[8];	/* 0xB0 */
 	volatile __le32 ByteMask[4][4];	/* 0xC0 */
-} __packed;
+};
 
 
 enum hw_mib {