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/level3/src/level3_adapter.cpp

@@ -70,6 +70,11 @@ OEMCryptoResult Level3_QueryKeyControl(OEMCrypto_SESSION session,
                                             key_control_block_length);
 }
 
+OEMCryptoResult Level3_GetEmbeddedDrmCertificate(
+    uint8_t* public_cert, size_t* public_cert_length) {
+  return OEMCrypto_ERROR_NOT_IMPLEMENTED;
+}
+
 OEMCryptoResult Level3_DecryptCENC_V17(
     OEMCrypto_SESSION session, const OEMCrypto_SampleDescription* samples,
     size_t samples_length, const OEMCrypto_CENCEncryptPatternDesc* pattern) {