Cleanup custom LOG_TAG in our CMakeLists files. (#51622)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51622

We currently support an optional 3rd params for `target_compile_reactnative_options` which allows to specify a LOG_TAG macro.
No one is actually reading that Macro. The only usage would be logging from the Android SDK which we don't explicitely use.

Here I'm updating our build to specify a LOG_TAG as `ReactNative` for all the targets without allowing to customize it as it just complicates our build setup.

Changelog:
[Internal] [Changed] -

Reviewed By: mdvacca

Differential Revision: D75445577

fbshipit-source-id: a426ce77ba6d1dfd0800e874d9f7838bfdc5b877