Add android.os.VintfRuntimeInfo

This is the Java API for ::android::vintf::RuntimeInfo.
This will be used by CTS for device info report purposes.

Bug: 28656227
Test: cts-tradefed run cts -m CtsEdiHostTestCases --skip-preconditions
Change-Id: Id87c95a17e77d7ec1794a6f850de97edf9ae892d