add vs6621s support in kernel

lin

2025-07-31 065ea569db06206874bbfa18eb25ff6121aec09b

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android/out/
longan/.buildconfig
longan/kernel/linux-4.9/arch/arm64/boot/dts/sunxi/board.dts
longan/out/
android/device/softwinner/ceres-c3/fstab.sun50iw10p1.noverify
 
longan/device/.BoardConfig.mk
longan/device/config/chips/a133/configs/c3/sys_config.fex