mav 3e0a8c2a48 Improvements around attach, reset and detach.
This change fixes DMA resource leak on driver unload.  Also it removes
DMA resources allocation for hardcoded number of requests before fetching
the real number from firmware.  Also it prepares ground for more flexible
IRQs allocation according to firmware capabilities.

MFC after:	2 weeks
2017-03-14 08:03:56 +00:00
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