Moved OEMCryptoResult string converter.

[ Merge of http://go/wvgerrit/170073 ]

Removed the file "error_string_util.cpp" and its header, moving the
OEMCryptoResult to string converter to "wv_cdm_types.cpp".  This extra
file served little purpose, and created a dependency on the CDM utils
to the CDM itself.

This is part of the effort to fix the formatting of WV metrics; making
enum-to-string conversion uniform throughout the CDM.

Bug: 239462891
Test: adb shell dumpsys android.hardware.drm.IDrmFactory/widevine -m
Test: Manual testing with Google TV
Change-Id: I4bf95d26b623f5b8fa86bdb2578cbc4ee65125cb

libwvdrmengine/src/WVDrmFactory.cpp

@@ -23,7 +23,6 @@
 #include "WVUUID.h"
 #include "android-base/properties.h"
 #include "cutils/properties.h"
-#include "error_string_util.h"
 #include "wv_cdm_constants.h"
 #include "wv_content_decryption_module.h"
 #include "wv_metrics.h"

libwvdrmengine/src/wv_metrics.cpp

@@ -14,7 +14,6 @@
 
 #include <aidl/android/hardware/drm/Status.h>
 #include "OEMCryptoCENC.h"
-#include "error_string_util.h"
 #include "wv_cdm_types.h"
 
 using namespace drm_metrics;
@@ -202,7 +201,8 @@ string FormatAttributes(const string& indent, const Attributes& attributes) {
     result.append("oemcrypto_result:\n");
     string next_indent = indent + kIndentSpaces;
     result.append(next_indent + "name: ");
-    result.append(::wvutil::OEMCryptoResultToString(attributes.oem_crypto_result()));
+    result.append(::wvcdm::OemCryptoResultToString(
+        static_cast<OEMCryptoResult>(attributes.oem_crypto_result())));
     result.append("\n" + next_indent + "value: ");
     result.append(to_string(attributes.oem_crypto_result()));
   }