i40evf: don't use more queues than CPUs

i40evf: don't use more queues than CPUs

It's kind of silly to configure and attempt to use a bunch of queue
pairs when you're running on a single (virtual) CPU. Instead of
unconditionally configuring all of the queues that the PF gives us,
clamp the number of queue pairs to the number of CPUs.

Change-ID: I321714c9e15072ee76de8f95ab9a81f86ed347d1
Signed-off-by: Mitch Williams <[email protected]>
Signed-off-by: Patrick Lu <[email protected]>
Tested-by: Jim Young <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>