defconfig: msm8909: Enabling kernel configs for VPN

- Enabling PPPOLAC and PPPOPNS configs for L2TP
  VPN to work
- Enabling Some of the defconfig options to be
  in sync with Android base config

CRs-Fixed: 778175
Change-Id: I8924c4c96961b6614fd62d79535987e481979d82
Signed-off-by: Ravinder Konka <rkonka@codeaurora.org>