arm64: rockchip: rk3399-puma: enable memory frequency scaling

DDR memory frequency scaling is called DMC (dynamic memory controller)
in the RK3399 SoC.

Enable it in the DTS and in the defconfig.

To improve the reaction time of the rockchip_dmc governor, CONFIG_HZ_PERIODIC
is enabled, at the cost of a 3% idle power increase. I see worst case reaction
times of tens of seconds without it, because devfreq_dmc_ondemand_func does not
get to run.

The upthreshold and downdifferential values in the DTS are more aggressive than
what rockchip uses. This improves U-Boot make -j6 compile time by 8%.

Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>

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