Re-hide ApplicationInfo.volumeUuid.

The @hide annotation was removed during Oreo development but then
storageUuid was created instead to be the public field. Changing
volumeUuid back to @hide since the system still uses it.

Bug: 135214188
Test: Android builds
Change-Id: I8b3c544daecfe43f5a725ea3080d90a167dcc463
2 files changed