cpufreq: Use imx-cpufreq-dt for i.MX8MP's speed grading

Add i.MX8MP to blacklist, so that imx-cpufreq-dt driver can handle
speed grading bits just like other i.MX8M SoCs.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
1 file changed