[ofw][patch][MLX4] added MSI-X support to MLX4 driver

[Leonid Keller]

This patch adds MSI-X support to MLX4 driver.
To remind, current driver creates 2 EQs (for commands/events and
completions), which both use 1 legacy interrupt.
With this patch MLX4 requests (in inf file) 18 MSI-X interrupt vectors,
spreaded across processors in round-robin way.
If the platform doesn't support MSI-X vectors, the driver uses legacy
interrupts.
 
MSI-X support required some changes in the card reset mechanism, which
is also found in the patch.
 
 
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