i40e: Add RSS configuration to virtual channel

Add opcodes and structures to support RSS configuration by PF driver on
behalf of the VF drivers. This reduces complexity in the VF driver and
allows us to support future hardware designs without modifying the VF
driver.

Change-ID: I8c75765c630eacb71f95967f1109a198542593ac
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>