[ Merge of http://go/wvgerrit/152674 ]
This allows an app to query the provisioning model. Possible
values are { "DrmCertificate", "Keybox", "OEMCertificate",
"BootCertificateChain" }
An app can use these to disntinguish between provisioning models.
Provisioning 4.0 (boot certificate chain) requires a double provisioning
step.
Bug: 234057551
Test: WV unit/integration tests, libwvdrmdrmplugin_hal_test
Change-Id: I1611488ec632a0e5a9e1d106b7475e8f5a2a5a13
cd593979e9