linux-phytec-ti

clocksource: dw_apb_timer_of: Do not trace read_sched_clock

We do not need to trace read_sched_clock function,
so add notrace attribute for this function.

Signed-off-by: Yang Wei <Wei.Yang@windriver.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>