The current implementation does not allow the user to enable both
hw-tc-offload and ntuple features on the interface. These checks
are added as TC flower offload and ntuple features internally configures
the same hardware resource MCAM. But TC HTB offload configures the
transmit scheduler which can be safely enabled on the interface with
ntuple feature.

This patch adds the same and ensures only TC flower offload and ntuple
features are mutually exclusive.
Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>