util: Pass 128-bit arguments directly instead of using pointers.

util: Pass 128-bit arguments directly instead of using pointers.

Commit f2d105b5 (ofproto-dpif-xlate: xlate ct_{mark, label} correctly.)
introduced the ovs_u128_and() function.  It directly takes ovs_u128
values as arguments instead of pointers to them.  As this is a bit more
direct way to deal with 128-bit values, modify the other utility
functions to do the same.

Signed-off-by: Justin Pettit <jpettit@ovn.org>
Acked-by: Joe Stringer <joe@ovn.org>