octeontx2-pf: send correct vlan priority mask to npc_install_flow_req

This patch corrects the erroneous vlan priority mask field that was
send to npc_install_flow_req.

Fixes: 1d4d9e42

 ("octeontx2-pf: Add tc flower hardware offload on ingress traffic")
Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>