Native fault in MediaDrm property call

OEMCrypto was being initialized on session creation. Calls to
get property information may occur before any sessions are
created. This resulted in calls to OEMCrypto before a call to
OEMCrypto_Initialize which caused a segfault.

OEMCrypto initialization is now verified before any other calls are made.
Unit tests have been modified to verify that this indeed works.

bug: 8660973

Change-Id: I1b14fa8ad2e88750776b28715a48d8a1d1c57089

libwvdrmengine/cdm/test/request_license_test.cpp

@@ -200,10 +200,6 @@ TEST_F(WvCdmRequestLicenseTest, QueryKeyStatus) {
 }
 
 TEST_F(WvCdmRequestLicenseTest, QueryStatus) {
-  decryptor_.OpenSession(g_key_system, &session_id_);
-  GenerateKeyRequest(g_key_system, g_key_id);
-  VerifyKeyRequestResponse(g_license_server, g_client_auth, g_key_id, false);
-
   CdmQueryMap query_info;
   CdmQueryMap::iterator itr;
   EXPECT_EQ(wvcdm::NO_ERROR, decryptor_.QueryStatus(&query_info));