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

8250/16550 and compatible serial early printk driver

modulename: early_printk_8250.ko

configname: CONFIG_EARLY_PRINTK_8250

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

source code:
arch/mips/kernel/early_printk_8250.c
depends
CONFIG_EARLY_PRINTK |
| CONFIG_USE_GENERIC_EARLY_PRINTK_8250