add build kerneldeb -- modify dts

hc

2023-10-25 6c2073b7aa40e29d0eca7d571dd7bc590c7ecaa7

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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