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Draft: improve interconnect support with devfreq

Martin Kepplinger requested to merge martin.kepplinger/linux-next:5.15-rc4/librem5__integration_byzantium_new_devfreq_interconnect into next/byzantium

this is testing https://lore.kernel.org/linux-arm-kernel/1631554694-9599-1-git-send-email-abel.vesa@nxp.com/ with a few patches on top for our specific case.

power usage: With screen off, recording /sys/class/power_supply/max170xx_battery/current_now for a few minutes and averaged over all values, I get "promising" values:

5.15 with new interconnects except usdhc			-310578,05
5.15								-313038,5

5.15 with new interconnects except usdhc with stress -c 1	-387765,775
5.15 with stress -c 1						-401825,5

with screen on, as-is, it might consume a bit more power since 32700000.interconnect is running at 800mhz instead of 400 right now, but that's something we should be able to change.

Edited by Martin Kepplinger

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