EMC clock is always-on and can't be zero. Check whether clk_round_rate()
returns zero rate and error out if it does. It can return zero if clock
tree isn't initialized properly.
Acked-by: NChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: NDmitry Osipenko <digetx@gmail.com>
Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org>