mmdevapi: Use UINT32 for a number of frames and UINT64 to sum them.

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

Hi,

note that coreaudio:written_frames is unused, but it's maybe too early
to remove it since I don't know how to make GetPosition
work correctly (bug #28039).

OSS:inbuf_frames also sums frames, but it only handles
Period- and UINT32-sized entities, hence UINT32 is TRT.

Somehow I apologize for sending only trivial patches
while the big design discussions are still ongoing...

Regards,
	Jörg Höhle
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