adjust clat map/key to include whether it's ipv4 or ipv6

(this is for consistency with upcoming changes to tethering maps/programs)

Generated based on output of:
  git grep 'clat_ingress_map|ClatIngressKey|ClatIngressValue|clat_egress_map|ClatEgressKey|ClatEgressValue'
  git grep 'getClatIngressProgFd|getClatEgressProgFd|getClatIngressMapFd|getClatEgressMapFd'

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I57189788e6f7fef4b0cac993d8e2d4ec6a506213