Revert "msm: ipa4: add support for 6 PDNs"

This reverts commit ce00308aa1f104f4ed6573048d6e44552662d998.
Revert commit because it will cause tethering/hotspot client cannot
connect to IPV4 webside.

Bug: 157902559
Test: Tethering and hotspot test
Change-Id: I1716b09973146a94446758713e510e87bcafb229
Signed-off-by: Mars Lin <marslin@google.com>
2 files changed