[DO NOT MERGE] Revert "Restructed reference root of trust (2/3 DRM Cert)"

This reverts commit f6f5099604.

Reason for revert: Feature missed deadline

Bug: 135283522
Change-Id: Ic86930ee3444c5a6aa1d78ae3a12a9030c29ef92

libwvdrmengine/oemcrypto/ref/src/oemcrypto_engine_device_properties_prov30.cpp

@@ -65,7 +65,7 @@ class Prov30CryptoEngine : public CryptoEngine {
       return OEMCrypto_ERROR_SHORT_BUFFER;
     }
     memcpy(public_cert, kOEMPublicCert, kOEMPublicCertSize);
-    if (!session->LoadRsaDrmKey(kOEMPrivateKey, kOEMPrivateKeySize)) {
+    if (!session->LoadRSAKey(kOEMPrivateKey, kOEMPrivateKeySize)) {
       LOGE("Private RSA Key did not load correctly.");
       return OEMCrypto_ERROR_INVALID_RSA_KEY;
     }