CONFIG_CPU_R5500 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

R5500

configname: CONFIG_CPU_R5500

CPU type
└─>R5500
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
NEC VR5500 and VR5500A series processors implement 64-bit MIPS IV
instruction set.