add support 4g -- >ppp

hc

2023-11-24 2b26ab132d1b33b91c84c6d732456200e8c5ee77

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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/"