CONFIG_E6500_CPU is not available for the selected architecture x86.
Result is shown for architecture powerpc

Freescale e6500

configname: CONFIG_E6500_CPU

CPU selection
└─>Freescale e6500
In linux kernel since version 3.10 (release Date: 2013-06-30)

depends
CONFIG_PPC64
CONFIG_PPC_E500
NOT CONFIG_CC_IS_CLANG