PM / devfreq: tegra: Support Tegra30

The devfreq driver can be used on Tegra30 without any code change and
it works perfectly fine, the default Tegra124 parameters are good enough
for Tegra30.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
[Modified by MyungJoo to depends on Tegra30/114/124/210 only]
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>