CONFIG_MPC8560 is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

CONFIG_MPC8560 (not configurable)

configname: CONFIG_MPC8560

Linux Kernel Configuration
└─>Freescale 85xx options
└─>MPC8560
In linux kernel since version 2.6.12  

is selected by
CONFIG_CPM2