[NET]: Wider use of for_each_*cpu()

[NET]: Wider use of for_each_*cpu()

In 'net' change the explicit use of for-loops and NR_CPUS into the
general for_each_cpu() or for_each_online_cpu() constructs, as
appropriate.  This widens the scope of potential future optimizations
of the general constructs, as well as takes advantage of the existing
optimizations of first_cpu() and next_cpu(), which is advantageous
when the true CPU count is much smaller than NR_CPUS.

Signed-off-by: John Hawkes <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>