i40e: rename rss_size to alloc_rss_size in i40e_pf

i40e: rename rss_size to alloc_rss_size in i40e_pf

Orabug: 22342532

This patch renames rss_size to alloc_rss_size in i40e_pf, which is
clearer and avoids confusion. It also adds comments to the other
related structure members to help clarify usage.

Change-ID: Ia90090609d006ab589cb639975bb8a0af795d16f
Signed-off-by: Helin Zhang <helin.zhang@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit acd65448f2e6b3407b8bb28b57d711ca417ea679)
Signed-off-by: Brian Maly <brian.maly@oracle.com>