CONFIG_M5206 is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

MCF5206

modulename: m5206.ko

and/or

timers.ko

configname: CONFIG_M5206

CPU
└─>MCF5206
In linux kernel since version 2.6.12  
Motorola ColdFire 5206 processor support.

source code:
arch/m68k/platform/coldfire/

depends
 or  NOT CONFIG_MMU