linux-imx

MLK-17590-02 driver: soc: imx: update the busfreq flow on imx8mq

Currently, on imx8mq evk board, we only support 3200mts and 667mts
frequency setpoints. So the DDR DVFS flow need to be updated accordingly.

The dram pll and dram apb clock rate is changed in ATF when doing frequency,
in kernel side, we need to call the clk API to update the clock rate info
in clock tree.

Signed-off-by: Bai Ping <ping.bai@nxp.com>
Reviewed-by: Anson Huang <Anson.Huang@nxp.com>
(cherry picked from commit a69c3794f52d826762642cbdcf978a85784f386a)