ice: use ice_for_each_vsi macro when possible

Replace all instances of:
	for (i = 0; i < pf->num_alloc_vsi; i++)

with the following macro:
	ice_for_each_vsi(pf, i)

This will allow the code to be consistent since there are currently
cases of using both.

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>