CONFIG_M5272 is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

MCF5272

modulename: m5272.ko

configname: CONFIG_M5272

ColdFire SoC type
└─>MCF5272
In linux kernel since version 2.6.12  
Motorola ColdFire 5272 processor support.

source code:
arch/m68k/coldfire/

depends
NOT CONFIG_MMU

is selected by
CONFIG_FEC