Customize StubVolume implementation for ARC

This allow ARC to customize StubVolume implementation in vendor
partition.

Bug: 132796154
Test: Customize the implementation of StubVolume and check on device.
Ignore-AOSP-First: Will cherry-pick to AOSP.
Change-Id: I626a7ed4113b6132bb456b3258ee4a93b4f8a72e
1 file changed