add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

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STMicroelectronics STM32 Peripheral Reset Controller
====================================================
 
The RCC IP is both a reset and a clock controller.
 
Please see Documentation/devicetree/bindings/clock/st,stm32-rcc.txt