base on dfi result, we do ddr frequency scaling, register
dmc driver to devfreq framework, and use simple-ondemand
policy.
Signed-off-by: NLin Huang <hl@rock-chips.com>
Signed-off-by: NMyngJoo Ham <myngjoo.ham@samsung.com>
Reviewed-by: NChanwoo Choi <cw00.choi@samsung.com>