Use MediaDrm property to ignore installed keybox

Merge from Widevine repo of http://go/wvgerrit/135984

If the MediaDrm property string debugIgnoreKeyboxCount is set to 1,
then the keybox will be ignored on the next initialization. This will
force an OTA keybox reprovisioning.

Equivalently, a 1 may be written to the file
L1/debug_ignore_keybox_count.txt.

In order to test a failed reprovisioning step, a value of 2 may be
used.

Bug: 187646550
Merged-In: Ie7d34a8b355398855f4ec43dd95dd73c5907bdeb
Change-Id: Ie7d34a8b355398855f4ec43dd95dd73c5907bdeb

libwvdrmengine/cdm/src/wv_content_decryption_module.cpp

@@ -500,6 +500,11 @@ CdmResponseType WvContentDecryptionModule::CloseCdm(
   return NO_ERROR;
 }
 
+CdmResponseType WvContentDecryptionModule::SetDebugIgnoreKeyboxCount(
+    uint32_t count) {
+  return CdmEngine::SetDebugIgnoreKeyboxCount(count);
+}
+
 CdmResponseType WvContentDecryptionModule::SetDecryptHash(
     const std::string& hash_data, CdmSessionId* id) {
   if (id == nullptr) {