Add DRM reprovisioning request generation

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

Adding files not merged in ag/26501922

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: I839db69a48c1add196f9b56e6ee3812f549f814d

libwvdrmengine/oemcrypto/test/oec_device_features.cpp

@@ -151,6 +151,7 @@ void DeviceFeatures::PickDerivedKey() {
       derive_key_method = TEST_PROVISION_30;
       return;
     case OEMCrypto_DrmCertificate:
+    case OEMCrypto_DrmReprovisioning:
       if (OEMCrypto_ERROR_NOT_IMPLEMENTED != OEMCrypto_LoadTestRSAKey()) {
         derive_key_method = LOAD_TEST_RSA_KEY;
       }
@@ -237,6 +238,8 @@ const char* ProvisioningMethodName(OEMCrypto_ProvisioningMethod method) {
       return "OEMCrypto_OEMCertificate";
     case OEMCrypto_BootCertificateChain:
       return "OEMCrypto_BootCertificateChain";
+    case OEMCrypto_DrmReprovisioning:
+      return "OEMCrypto_DrmReprovisioning";
   }
   // Not reachable
   return "";