CONFIG_BT_HCIUART_SERDEV (not configurable)

configname: CONFIG_BT_HCIUART_SERDEV

Linux Kernel Configuration
└─>Networking support
└─>Bluetooth subsystem support
└─>Bluetooth device drivers
└─>BT_HCIUART_SERDEV
In linux kernel since version 3.10 (release Date: 2013-06-30)  

is selected by
CONFIG_BT_HCIUART_LL