Add VNDK APEXes (current, v27, v28, v29)

'apex_vndk' module definitions for VNDK APEXes.
Each version has its own apex module with key pair and certificate.
They share file_context from /system/sepolicy

Bug: 134357236
Test: boot from mixed build (Q system + P vendor, aosp_arm64)
Change-Id: I64f9c4047eea6f2aaafd8b80f5eb4159fe6c4342
21 files changed
tree: fa1f2fa1241d8cbcdbb82db8b217d2c1292df5d9
  1. apex/