add rk809 spk hp

hc

2023-02-15 812ded0d8d6800728c4c11abed7546d735449123

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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