Update whitelisted package name for google vr

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
diff --git a/core/tasks/check_boot_jars/package_whitelist.txt b/core/tasks/check_boot_jars/package_whitelist.txt
index f25abf9..15b9990 100644
--- a/core/tasks/check_boot_jars/package_whitelist.txt
+++ b/core/tasks/check_boot_jars/package_whitelist.txt
@@ -236,4 +236,4 @@
 ###################################################
 # Packages in the google namespace across all bootclasspath jars.
 com\.google\.android\..*
-com\.google\.vr\.gvr\..*
+com\.google\.vr\.platform.*