Add to/from disk stable format

This change adds a utility to convert persistable bundles to and from
disk-stable byte arrays.

Bug: 192078259
Test: atest FrameworksVcnTests:PersistableBundleUtilsTest
Change-Id: Ifafb7081ec6a34ce3ab8e2aa502d46411405cb6d
(cherry picked from commit 823599b4a86ba20638a41bac66cadefeeae05108)
Merged-In: Ifafb7081ec6a34ce3ab8e2aa502d46411405cb6d
2 files changed