Move pppd chowning to separate init script

Signed-off-by: zombah <zombah@gmail.com>
init.rc: Remove pppd chowning to standalone script

Signed-off-by: zombah <zombah@gmail.com>
fstab: Switch to by-name mounting and clean mount options

Signed-off-by: zombah <zombah@gmail.com>
Revert "overlay: values: Use network attribute list from vendor_mbm"

This reverts commit 5809b9a343590cac5970ecd5f52b91938112430b.