The vr platform lib was renamed from com.google.vr.gvr.platform to
com.google.vr.platform, so update the whitelist accordingly. Also narrow
the whitelist to just the .platform subpackage.
Bug: 38134403
Test: Booted a Marlin.
Change-Id: I9243ed3ab7a918e0bc716a7ddafe0b3c068700de