CONFIG_SERIAL_8250_DWLIB (not configurable)

configname: CONFIG_SERIAL_8250_DWLIB

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>SERIAL_8250_DWLIB
In linux kernel since version 4.19.3 (release Date: 2018-11-21)  

is depended by
CONFIG_SERIAL_8250_LPSS