CONFIG_EARLY_PRINTK_8250 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_EARLY_PRINTK_8250 (not configurable)

modulename: early_printk_8250.ko

configname: CONFIG_EARLY_PRINTK_8250

Linux Kernel Configuration
In linux kernel since version 3.13 (release Date: 2014-01-19)  
"8250/16550 and compatible serial early printk driver"
If you say Y here, it will be possible to use a 8250/16550 serial
port as the boot console.

source code: