Switching glamo-mci to threaded IRQs

[Thibaut Girka]

Hi,
During a little talk with Lars on #openmoko-cdevel about the state of
the OM drivers, one of the "issues" of the glamo driver was the use of
workqueues instead of threaded IRQs for IRQ handling in glamo-mci.

Here is a patch trying to fix that.
It seems to work fine, however, I'm new to this kind of things, and
discovered the glamo code today :)
So, I may have missed something important, but anyway, here is the
patch.

Best Regards,
Thibaut Girka
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