CONFIG_EMBEDDEDBOOT is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_EMBEDDEDBOOT.
Result is shown for kernelversion 5.4.123

CONFIG_EMBEDDEDBOOT (not configurable)

configname: CONFIG_EMBEDDEDBOOT

Linux/PowerPC Kernel Configuration
└─>Kernel options
└─>EMBEDDEDBOOT
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
depends
CONFIG_8260 or CONFIG_8xx