default or selected kernelversion does not have config value CONFIG_OLPC_OPENFIRMWARE_DT.
Result is shown for kernelversion 5.4.69

CONFIG_OLPC_OPENFIRMWARE_DT (not configurable)

modulename: olpc_dt.ko

configname: CONFIG_OLPC_OPENFIRMWARE_DT

Linux Kernel Configuration
└─>Bus options (PCI etc.)
└─>OLPC_OPENFIRMWARE_DT
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
source code:
arch/x86/platform/olpc/olpc_dt.c

depends
CONFIG_X86_32