Adjust provisioning retry

Merge from Widevine repo of http://go/wvgerrit/94243

When generating a second provisioning request, a new session should be
opened because a session can only have one nonce for v16.

For Provisioning 3.0 devices, the OEM Cert's private key must be
loaded in the new session.

Test: WvCdmRequestLicenseTest.ProvisioningInterposedRetryTest
Bug: 135288420 Nonce reuse
Bug: 141655126 Cert reload
Change-Id: I8a96566142c4d4380e2bdd571e8d363a7a1f74d4

libwvdrmengine/cdm/core/src/certificate_provisioning.cpp

@@ -199,6 +199,7 @@ CdmResponseType CertificateProvisioning::GetProvisioningRequest(
 
   default_url->assign(kProvisioningServerUrl);
 
+  if (crypto_session_->IsOpen()) crypto_session_->Close();
   CdmResponseType status = crypto_session_->Open(requested_security_level);
   if (NO_ERROR != status) {
     LOGE("Failed to create a crypto session: status = %d",