i40e: Fix wrong check for I40E_TXR_FLAGS_WB_ON_ITR

[ Upstream commit 77a8c982 ]

The I40E_TXR_FLAGS_WB_ON_ITR is i40e_ring flag and not i40e_pf one.

Fixes: 8e0764b4

 ("i40e/i40evf: Add support for writeback on ITR feature for X722")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20231023212714.178032-1-jacob.e.keller@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>