Add DRM reprovisioning request generation

[ Merge of http://go/wvgerrit/192010 ]

Updates the CDM to add support for DRM reprovisioning request creation.
- Load the baked-in certificate for use as the client token.
- Add functions to build and sign a drm reprovisioning request.
- Update the Rikers L3 OEMCrypto implementation to support signing
  provisioning requests and getting embedded certificate.
- Update client id token to handle DRM reprovisioning.
- Add OEMCrypto function to load the baked-in device certificate in
  Rikers CDMs and stubs for non-Rikers CDMs.
- Add dynamic adapter support for getting embedded device certificate
  only on L3.

Bug: 305093063
Test: WVTS
Change-Id: I9a0ecf95e27213b046f03baa0781fb164179323b

libwvdrmengine/cdm/core/src/client_identification.cpp

@@ -104,7 +104,8 @@ CdmResponseType ClientIdentification::InitForOtaKeyboxProvisioning(
 
 /*
  * Return the ClientIdentification message token type for provisioning request.
- * NOTE: a DRM Cert should never be presented to the provisioning server.
+ * NOTE: a DRM Cert should never be presented to the provisioning server unless
+ * DRM re-provisioning is being used.
  */
 CdmResponseType ClientIdentification::Prepare(
     const CdmAppParameterMap& app_parameters,
@@ -403,9 +404,11 @@ bool ClientIdentification::GetProvisioningTokenType(
       }
       return true;
     }
-    case kClientTokenDrmCert:
-    // TODO: b/305093063 - Add token for DRM reprovisioning requests.
     case kClientTokenDrmReprovisioning:
+      *token_type =
+          video_widevine::ClientIdentification::DRM_DEVICE_CERTIFICATE;
+      return true;
+    case kClientTokenDrmCert:
     default:
       // shouldn't happen
       LOGE("Unexpected provisioning type: %d", static_cast<int>(token));