USB DMA memory Allocation

[aseem.jolly]

I don't want to play around with 'kern.maxbcache', can we actually allow
driver to support 64 bit DMA?
In future we can use a bootarg/sysctl to enable this support if someone
comes across this issue else we will use 32 bit DMA allocations.

I am willing to enable this support, please guide me.



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