Include vndk 29 in GSI

VNDK snapshot v29 has been merged (in ag/8733395) on internal master.
With this CL, GSI can be used to test with Q (v29) vendor images.

Bug: 138981518
Test: $ lunch aosp_x86-userdebug
      $ m

Change-Id: I3e4677e12524ee603cf152e1f07aceea56791b88