net: qos offload add flow status with dropped count

This patch adds a drop frames counter to tc flower offloading.
Reporting h/w dropped frames is necessary for some actions.
Some actions like police action and the coming introduced stream gate
action would produce dropped frames which is necessary for user. Status
update shows how many filtered packets increasing and how many dropped
in those packets.

v2: Changes
 - Update commit comments suggest by Jiri Pirko.

Signed-off-by: Po Liu <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Vlad Buslov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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