More precisely operate our DSP_SETTRIGGER calls

[Jeremy White]

On my i810 audio chipset, failing to do a set trigger of 0
prior to the mmap prevents the output from ever running.
Prior to this patch, we would do a set trigger of 1 (input only),
followed by a set trigger of 3 (input + output).

And since my laptop doesn't support full duplex, it was non sensical
to try to operate both input and output at the same time...

This patch fixes that, and tweaks a few other cases.

Changelog:
   More correctly establish cases where the OSS input buffer
should not be enabled.
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