update defconfig for hid_generic support

This should have been included in previous hid/uhid commits, but was
overlooked. Although this should get set automatically with the previous
commits, it's getting included here for completeness.
update PPPoPNS driver

This updates the PPPoPNS driver to match source found in
https://github.com/CyanogenMod/android_kernel_sony_msm8x60
with commit bb3c9e303cad7798d102433bfe1669d4382cbc4a in cm-10.1 branch.

This fixes PPTP connections with MPPE (encryption) enabled.
ppp: update PX_PROTO_ defines to match userspace
update defconfig for VPN

Only PPTP and L2TP/IPSec PSK connections have been tested.