drivers: net: xgene: Fix hardware checksum setting

This patch fixes the hardware checksum settings by properly program
the classifier. Otherwise, packet may be received with checksum error
on X-Gene1 SoC.

Signed-off-by: Quan Nguyen <qnguyen@apm.com>
Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>