dt-bindings: devfreq: rk3399_dmc: Add more disable-freq properties

DDR DVFS tuning has found that several power-saving features don't have
good tradeoffs at higher frequencies -- at higher frequencies, we'll see
glitches or other errors. Provide tuning controls so these can be
disabled at higher OPPs, and left active only at the lower ones.

Signed-off-by: Brian Norris <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>

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