Unit Tests for Security Patch Level

Merge of widevine change http://go/wvgerrit/16249

This CL adds unit tests and reference code for the security patch
level, which is a new feature in OEMCrypto v11.  This CL also adjusts
the dynamic and static adapters to still run with devices that have a
v10 OEMCrypto.

The level 3 haystack code will be updated in a future CL.

bug: 26188985

Change-Id: I518ef46b4098cf3718fe0c0390bfb6825db4fb6b

libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_mock.cpp

@@ -683,6 +683,14 @@ bool SessionContext::InstallKey(const KeyId& key_id,
     LOGE("Anti-rollback hardware is required but hardware not present.");
     return false;
   }
+  uint8_t minimum_patch_level
+      = (key_control_block.control_bits() & kControlSecurityPatchLevelMask) >>
+      kControlSecurityPatchLevelShift;
+  if (minimum_patch_level > OEMCrypto_Security_Patch_Level()) {
+    LOGE("[InstallKey(): security patch level: %d.  Minimum:%d]",
+         OEMCrypto_Security_Patch_Level(), minimum_patch_level);
+      return false;
+  }
 
   if (!CheckNonceOrEntry(key_control_block, pst)) {
     LOGE("Failed Nonce/PST check.");