Create new token types for DRM reprovisioning

Creates new token types for the DRM reprovisioning scheme that will be
used by L3 CDMs with baked-in certificates to allow for use of unique
serial numbers.

- Create new `CdmClientTokenType` for DRM reprovisioning in the CDM
  core.
- Create a new `ProvisioningType` for DRM reprovisioning in the
  provisioning message proto.
- Create new enum value for `DEVICE_EMBEDDED` in DrmCertificate type.
- Update uses of the above to include the new token types.

Bug: b/305093063
Merged from https://widevine-internal-review.googlesource.com/186934

Change-Id: I7e6cc8744b80cbbb624d31e5be1eab1be8a9680f

libwvdrmengine/cdm/core/src/client_identification.cpp

@@ -384,6 +384,8 @@ bool ClientIdentification::GetProvisioningTokenType(
           video_widevine::ClientIdentification::BOOT_CERTIFICATE_CHAIN;
       return true;
     case kClientTokenDrmCert:
+    // TODO: b/305093063 - Add token for DRM reprovisioning requests.
+    case kClientTokenDrmReprovisioning:
     default:
       // shouldn't happen
       LOGE("Unexpected provisioning type: %d", static_cast<int>(token));