[NET_SCHED]: Remove CONFIG_NET_ESTIMATOR option

The generic estimator is always built in anways and all the config options
does is prevent including a minimal amount of code for setting it up.
Additionally the option is already automatically selected for most cases.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/sched/Kconfig
Simple merge

diff --cc net/sched/act_api.c
Simple merge

diff --cc net/sched/act_police.c
Simple merge

diff --cc net/sched/sch_api.c
Simple merge

diff --cc net/sched/sch_cbq.c
Simple merge

diff --cc net/sched/sch_generic.c
Simple merge

diff --cc net/sched/sch_hfsc.c
Simple merge