CONFIG_M5206e is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

MCF5206e

modulename: m5206.ko

configname: CONFIG_M5206e

Linux Kernel Configuration
└─>MCF5206e
In linux kernel since version 2.6.12  
Motorola ColdFire 5206e processor support.

source code:
arch/m68k/platform/coldfire/