CONFIG_WANT_EARLY_SERIAL is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

CONFIG_WANT_EARLY_SERIAL (not configurable)

configname: CONFIG_WANT_EARLY_SERIAL

Linux Kernel Configuration
└─>WANT_EARLY_SERIAL
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
selects
CONFIG_SERIAL_8250