clockevents/drivers/dw_apb: Migrate to new 'set-state' interface

clockevents/drivers/dw_apb: Migrate to new 'set-state' interface

Migrate dw_apb driver to the new 'set-state' interface provided by
clockevents core, the earlier 'set-mode' interface is marked obsolete
now.

This also enables us to implement callbacks for new states of clockevent
devices, for example: ONESHOT_STOPPED.

Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>