CONFIG_USE_GENERIC_EARLY_PRINTK_8250 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_USE_GENERIC_EARLY_PRINTK_8250 (not configurable)

configname: CONFIG_USE_GENERIC_EARLY_PRINTK_8250

Linux Kernel Configuration
└─>Kernel hacking
└─>USE_GENERIC_EARLY_PRINTK_8250
In linux kernel since version 3.15 (release Date: 2014-06-08)  
is depended by
CONFIG_MIPS_COBALT