okhttp: remove irrelevant logs for non-android platform

[ghmulti]

We are using the io.grpc:grpc-okhttp library on the backend, and it appears that this warning is irrelevant for non-Android platforms. However, this false-positive warning triggers log alarms, which is very unfortunate.

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[ejona86]

PLATFORM will be null at that point, as those methods are being used to initialize platform. We should instead delete the warning (and delete the method's comment saying it will log on failure).

[ejona86]

#11591 was merged in favor of this PR.

[ghmulti]

Nice, thanks for fixing this! 👏 😎