i40evf: Allocate Rx buffers properly

i40evf: Allocate Rx buffers properly

Orabug: 23176970

Allocate the correct number of RX buffers, and don't fiddle with
next_to_use. The common RX code handles all of this. This fixes a memory
leak of one page each time the driver is opened.

Change-Id: Id06eca353086e084921f047acad28c14745684ee
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit b163098ea1eece88a8834952dcbade1f17378731)
Signed-off-by: Brian Maly <brian.maly@oracle.com>