add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

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STM32F746 DISCOVERY BOARD
M:    Vikas Manocha <vikas.manocha@st.com>
S:    Maintained
F:    board/st/stm32f746-disco
F:    include/configs/stm32f746-disco.h
F:    configs/stm32f746-disco_defconfig