Add VintfObjectRecovery

A special VintfObject for recovery. CheckCompatibility
knows how to mount /system and /vendor if necessary.

Test: testing with a test CL that replaces graphics test
      into calling android::vintf::details::mountSystem
      / mountVendor, and the partitions are actually
      mounted.

Bug: 36814503
Change-Id: Ie6a8e533841a128a411134973006ac4afb17a78e
6 files changed