CONFIG_M547x is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

MCF547x

configname: CONFIG_M547x

CPU
└─>MCF547x
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support.