Support ATSC license installation

[ Merge of http://go/wvgerrit/163900/ ]

ATSC licenses can be saved by calling
MediaDrm#setPropertyString("storeAtscLicense",<value>)
where <value> is
"<atsc-key-set-ID>:<license-file-data in Base64 format>"

Before storing an ATSC license a session must be opened and the
ATSC mode must be enabled.

Use MediaDrm#setPropertyString("atscMode","enable");

Bug: 176871821
Test: WV Unit/integration/Luci tests
Test: libwvdrmdrmplugin_hal_test
Test: GtsMediaTestCases
Change-Id: Iec2a8b7f87b1122395d06856202278b92316fdfe

libwvdrmengine/cdm/src/wv_content_decryption_module.cpp

@@ -656,6 +656,15 @@ CdmResponseType WvContentDecryptionModule::GetSessionUserId(
   return CdmResponseType(NO_ERROR);
 }
 
+CdmResponseType WvContentDecryptionModule::StoreAtscLicense(
+    const CdmIdentifier& identifier,
+    RequestedSecurityLevel requested_security_level,
+    const CdmKeySetId& key_set_id, const std::string& serialized_license_data) {
+  CdmEngine* cdm_engine = EnsureCdmForIdentifier(identifier);
+  return cdm_engine->StoreAtscLicense(requested_security_level, key_set_id,
+                                      serialized_license_data);
+}
+
 bool WvContentDecryptionModule::SetDefaultOtaKeyboxFallbackDurationRules() {
   CdmEngine* cdm_engine = EnsureCdmForIdentifier(kDefaultCdmIdentifier);
   if (!cdm_engine) return false;