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
Change-Id: Ie7d34a8b355398855f4ec43dd95dd73c5907bdeb

libwvdrmengine/cdm/core/src/crypto_session.cpp

@@ -3031,6 +3031,11 @@ OEMCryptoResult CryptoSession::LegacyDecryptInChunks(
   return sts;
 }
 
+CdmResponseType CryptoSession::SetDebugIgnoreKeyboxCount(uint32_t count) {
+  OEMCryptoResult status = OEMCrypto_SetDebugIgnoreKeyboxCount(count);
+  return MapOEMCryptoResult(status, UNKNOWN_ERROR, "SetDebugIgnoreKeyboxCount");
+}
+
 okp::SystemFallbackPolicy* CryptoSession::GetOkpFallbackPolicy() {
   const auto getter = [&]() -> okp::SystemFallbackPolicy* {
     // If not set, then OTA keybox provisioning is not supported or