add support mipi 1280x800_LCD

hc

2023-03-15 de7d2b82e1d37d435e0b93009a6a472b54b9d6a1

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BR2_mips=y
BR2_mips_32r2=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_MIPS=y