Make vold use the updated keystore 2 API for storage keys.

This CL updates vold to use the updated storage key API that provides an
optional upgraded key blob. In this patch the upgraded key blob is not
yet stored by vold.

Bug: 185811713
Test: N/A
Change-Id: I39eeb20df0eb2b023479f3adebab264d29d00048
1 file changed