Cherry pick cdm udc-widevine-release changes to udc-widevine-dev to be in sync with 18.3 release

Merged from go/wvgerrit/178231

Bug: 290252845
Test: WVTS tests seem to be running and passing
Change-Id: Ifff9123a73e173e835a6e89ba7c2760e1cd500fd
(cherry picked from commit 6889845d2e7e24f22c00b333335c34259b3fc96e)

libwvdrmengine/oemcrypto/test/fuzz_tests/oemcrypto_opk_dispatcher_fuzz.cc

@@ -3,7 +3,7 @@
 #include "opk_dispatcher.h"
 #include "opk_init.h"
 
-namespace wvoec {
+namespace {
 
 void OpenOEMCryptoTASession() {
   uint8_t request_body[] = {
@@ -35,6 +35,8 @@ void InitializeOEMCryptoTA() {
   OPK_DispatchMessage(&request, &response);
 }
 
+} // namespace
+
 extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {
   OPK_Initialize();
   InitializeOEMCryptoTA();
@@ -51,5 +53,3 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   OPK_DispatchMessage(&request, &response);
   return 0;
 }
-
-}  // namespace wvoec