PM / AVS: SVS: Introduce SVS engine

[Roger Lu]

SVS driver use OPP adjust event in [1] to update
OPP table voltage part.

[1] https://patchwork.kernel.org/patch/10946069/

changes since v1:
- Add svs subnodes description in binding documents
- Set svs_cpu_little & svs_cci vmin to 0x18 to meet cpufreq
and cci software architecture.

Roger Lu (2):
  dt-bindings: soc: add mtk svs dt-bindings
  PM / AVS: SVS: Introduce SVS engine

 .../devicetree/bindings/power/mtk-svs.txt     |   88 +
 drivers/power/avs/Kconfig                     |   10 +
 drivers/power/avs/Makefile                    |    1 +
 drivers/power/avs/mtk_svs.c                   | 2086 +++++++++++++++++
 include/linux/power/mtk_svs.h                 |   23 +
 5 files changed, 2208 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/mtk-svs.txt
 create mode 100644 drivers/power/avs/mtk_svs.c
 create mode 100644 include/linux/power/mtk_svs.h