CONFIG_MACH_EUKREA_MBIMX51_BASEBOARD is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_EUKREA_MBIMX51_BASEBOARD.
Result is shown for kernelversion 6.2.5

Eukrea MBIMX51 development board

modulename: eukrea_mbimx51-baseboard.ko

configname: CONFIG_MACH_EUKREA_MBIMX51_BASEBOARD

Baseboard
└─>Eukrea MBIMX51 development board
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
This adds board specific devices that can be found on Eukrea's
MBIMX51 evaluation board.

source code:
arch/arm/mach-mx5/eukrea_mbimx51-baseboard.c