add support 4g -- >ppp

hc

2023-11-24 2b26ab132d1b33b91c84c6d732456200e8c5ee77

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# linux custom kernel at least 4.4.x
BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_4=y
 
BR2_LINUX_KERNEL_CUSTOM_LOCAL=y
BR2_LINUX_KERNEL_CUSTOM_LOCAL_LOCATION="$(TOPDIR)/../kernel"