add support 4g -- >ppp

hc

2023-11-24 2b26ab132d1b33b91c84c6d732456200e8c5ee77

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serdev-objs := core.o
 
obj-$(CONFIG_SERIAL_DEV_BUS) += serdev.o
 
obj-$(CONFIG_SERIAL_DEV_CTRL_TTYPORT) += serdev-ttyport.o