Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I56W9F

--------------------------------

When destination is not 8-byte aligned,
csum_partial_cfu_dest_unaligned() should be used to avoid kernel
unaligned exception.

Fixes: 2fcadd2861b4 ("sw64: optimize ip checksum calculation")
Signed-off-by: NMao Minkai <maominkai@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>