drivers: net: xgene: Fix wrong logical operation

This patch fixes the wrong logical OR operation by changing it to
bit-wise OR operation.

Fixes: 3bb502f8

 ("drivers: net: xgene: fix statistics counters race condition")
Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
Signed-off-by: Quan Nguyen <qnguyen@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>