Enable all platform tests in CMake

Author: GregoryComer

runtime/platform/test/CMakeLists.txt

@@ -19,10 +19,8 @@ include(${EXECUTORCH_ROOT}/tools/cmake/Test.cmake)
 
 et_cxx_test(platform_test SOURCES executor_pal_test.cpp)
 
-# TODO: Re-enable this test on OSS
-# et_cxx_test(platform_death_test SOURCES executor_pal_death_test.cpp)
+et_cxx_test(platform_death_test SOURCES executor_pal_death_test.cpp)
 
 et_cxx_test(logging_test SOURCES logging_test.cpp)
 
-# TODO: Re-enable this test on OSS
-# et_cxx_test(clock_test SOURCES clock_test.cpp stub_platform.cpp)
+et_cxx_test(clock_test SOURCES clock_test.cpp stub_platform.cpp)