soc: mediatek: Add MediaTek DVFS Resource Collector (DVFSRC) driver

soc: mediatek: Add MediaTek DVFS Resource Collector (DVFSRC) driver

The Dynamic Voltage and Frequency Scaling Resource Collector (DVFSRC) is a
Hardware module used to collect all the requests from both software and the
various remote processors embedded into the SoC and decide about a minimum
operating voltage and a minimum DRAM frequency to fulfill those requests in
an effort to provide the best achievable performance per watt.

This hardware IP is capable of transparently performing direct register R/W
on all of the DVFSRC-controlled regulators and SoC bandwidth knobs.

This driver includes support for MT8183, MT8192 and MT8195.

Co-Developed-by: Dawei Chien <dawei.chien@mediatek.com>
[Angelo: Partial refactoring and cleanups]
Reviewed-by: Georgi Djakov <djakov@kerenl.org>
Link: https://lore.kernel.org/r/20240610085735.147134-5-angelogioacchino.delregno@collabora.com
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>