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/oemcrypto/include/OEMCryptoCENC.h

@@ -521,6 +521,8 @@ typedef enum OEMCrypto_ProvisioningMethod {
   OEMCrypto_OEMCertificate = 3,
   // Device has Boot Certificate Chain (BCC).
   OEMCrypto_BootCertificateChain = 4,
+  // Device has baked in DRM certificate with reprovisioning (level 3 only).
+  OEMCrypto_DrmReprovisioning = 5
 } OEMCrypto_ProvisioningMethod;
 
 /**
@@ -740,6 +742,7 @@ typedef enum OEMCrypto_SignatureHashAlgorithm {
 #define OEMCrypto_GetUsageEntryInfo           _oecc148
 #define OEMCrypto_GetBCCType                  _oecc149
 #define OEMCrypto_LoadRelease                 _oecc150
+#define OEMCrypto_GetEmbeddedDrmCertificate   _oecc151
 // clang-format on
 
 /// @addtogroup initcontrol
@@ -6108,6 +6111,22 @@ OEMCryptoResult OEMCrypto_LoadProvisioning_V18(
 
 /****************************************************************************/
 /****************************************************************************/
+/* The following functions are used by internal L3 CDMs and are not required by
+ * other CDM implementations.
+ */
+
+/**
+ * Get the embedded Drm Certificate used by internal L3 CDMs.
+ *
+ * @param[out] public_cert where the certificate is stored.
+ * @param[in,out] public_cert_length the length, in bytes, of the certificate.
+ *
+ * @retval OEMCrypto_SUCCESS on success
+ * @retval OEMCrypto_ERROR_SHORT_BUFFER if public_cert_length is too small.
+ * @retval OEMCrypto_ERROR_NOT_IMPLEMENTED
+ */
+OEMCryptoResult OEMCrypto_GetEmbeddedDrmCertificate(uint8_t* public_cert,
+                                                    size_t* public_cert_length);
 
 #ifdef __cplusplus
 }