CONFIG_ARCH_WM8750 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

WonderMedia WM8750

configname: CONFIG_ARCH_WM8750

Linux Kernel Configuration
└─>WonderMedia WM8750
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Support for WonderMedia WM8750 System-on-Chip.