ice: Simplify ice_sriov_configure

Add a new function for checking if SR-IOV can be configured based on
the PF and/or device's state/capabilities. Also, simplify the flow in
ice_sriov_configure().

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>