add bootargs root

hc

2023-02-14 89db217f27d1d16339e417d7db6cfc7341442919

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BR2_arm=y
BR2_cortex_a35=y
BR2_ARM_FPU_VFPV4=y
BR2_PACKAGE_RK1806=y
BR2_ROOTFS_OVERLAY="board/rockchip/rk1806/fs-overlay-32/"