net/sched: add retpoline wrapper for tc

On kernels using retpoline as a spectrev2 mitigation,
optimize actions and filters that are compiled as built-ins into a direct call.

On subsequent patches we expose the classifiers and actions functions
and wire up the wrapper into tc.

Signed-off-by: Pedro Tammela <[email protected]>
Reviewed-by: Jamal Hadi Salim <[email protected]>
Reviewed-by: Victor Nogueira <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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