mmdevapi/tests: Fix some render test failures.

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

I got no answer so far from Maarten about the 16bit issue,
otherwise I would have merged in my audible 16bit patch.

- Some exclusive mode drivers appear to use a buffer of 1024 frames.
  I've used MulDiv() like in the other cases, but don't have enough data
  to tell whether ceil() or floor() would be more appropriate.
- BTW 5.333ms is 1024/192000.
- the one crash on a machine from "as" is mysterious, why did Activate or Initialize fail?
  Now we simply avoid the tests when either fails.
- Wait is adjusted such that the delta is the same for ALSA/OSS/MacOS

Regards,
	Jörg Höhle
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