clat ebpf code - use the more correct checksum summation type

Note that per kernel's //include/uapi/linux/types.h:
  typedef __u32 __bitwise __wsum;
so this is effectively a no-op.

Test: builds, booted/tested on a blueline on an ipv6-only network
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I8b10bb9ecd714bc18ed475cdb82dcbad50bcb25f
1 file changed