Allow provisioning model to be queried

[ 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

libwvdrmengine/mediadrm/src_hidl/WVDrmPlugin.cpp

@@ -1263,6 +1263,8 @@ Return<void> WVDrmPlugin::getPropertyString(const hidl_string& propertyName,
     status = queryProperty(wvcdm::QUERY_KEY_WATERMARKING_SUPPORT, value);
   } else if (name == "productionReady") {
     status = queryProperty(wvcdm::QUERY_KEY_PRODUCTION_READY, value);
+  } else if (name == "provisioningModel") {
+    status = queryProperty(wvcdm::QUERY_KEY_PROVISIONING_MODEL, value);
   } else {
     ALOGE("App requested unknown string property %s", name.c_str());
     status = Status::ERROR_DRM_CANNOT_HANDLE;