Add Property for Provisioning ID

Adds a property that allows applications to get the provisioning-unique serial
number.

Bug: 9175567

Also fixes some missing mutexes that were causing intermittent failures in
calls to OEMCrypto due to concurrency issues.

Bug: 9175583

Merge of https://widevine-internal-review.googlesource.com/#/c/5831/
from the Widevine CDM repository

Change-Id: I1d7e3ca9f3b06da345022f5f0d64e0c17a5cedca

libwvdrmengine/cdm/core/src/cdm_engine.cpp

@@ -403,6 +403,12 @@ CdmResponseType CdmEngine::QueryStatus(CdmQueryMap* key_info) {
     (*key_info)[QUERY_KEY_SYSTEM_ID] = system_id_stream.str();
   }
 
+  std::string provisioning_id;
+  success = crypto_engine->GetProvisioningId(&provisioning_id);
+  if (success) {
+    (*key_info)[QUERY_KEY_PROVISIONING_ID] = provisioning_id;
+  }
+
   return NO_ERROR;
 }