CONFIG_MACH_U8500 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_U8500.
Result is shown for kernelversion 6.2.5

U8500 Development platform

modulename: board-mop500.ko

and/or

board-mop500-u8500uib-rmi4.ko

configname: CONFIG_MACH_U8500

Linux Kernel Configuration
└─>Ux500 target platform (boards)
└─>U8500 Development platform
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
Include support for the mop500 development platform.

source code: