Includes these two commits:
iflib: Add sysctl to request extra MSIX vectors on driver load
Intended to be used with upcoming feature to add sub-interfaces, since
those new interfaces will be dynamically created and will need to have
spare MSI-X interrupts already allocated for them on driver load.
While here, fix some alignment of sysctl declarations as well.
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iflib: Add subinterface interrupt allocation function
The ice(4) driver will add the ability to create extra interfaces
that hang off of the base interface; to do that the driver requires
a method for the subinterface to request hardware interrupt resources
from the base interface.
Fix a related function definition argument line size issue as well.