MIPS Coherent Processor Systems (CPS), which include the MT7621 SoC, support
deep sleep idle states and have a specific cpuidle driver for them.
Enable support for it, while also switching from constant timer ticks to the
idle dynticks model, with the TEO governor.
Run-tested on a Redmi AC2100.
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
Signed-off-by: maurerr <mariusd84@gmail.com>
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