ice(4): Add MAC filter and VLAN resource limits to VFs

Adds two new parameters to iovctl config for VLAN filter limits and MAC
filter limits and gives them defaults of 64 and 16, respectively.

These are intended to limit the number of resources that a VF can
consume so that any one VF cannot starve an other VFs or the PF of
filters.

Signed-off-by: Eric Joyner <eric.joyner@intel.com>
Signed-off-by: Krzysztof Galazka <krzysztof.galazka@intel.com>
Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1573