be2net: fix flashing on big endian architectures

Flashing is broken on big endian architectures like ppc.
This patch fixes it.

From: Naresh G <nareshg@serverengines.com>
Signed-off-by: Ajit Khaparde <ajitk@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>