Deprecate VNDK-Lite

Android S would not support upgrade from O-MR1 devices, so VNDK Lite
configuration is no more valid. This change removes all VNDK-lite
variables from soong.

Bug: 158719241
Test: m -j passed
Change-Id: I54093fd4ee37ceddfc33a0b216b7069372040a0c
Merged-In: I54093fd4ee37ceddfc33a0b216b7069372040a0c