CONFIG_MACH_WM8505_7IN_NETBOOK is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

WM8505 7-inch generic netbook

modulename: wm8505_7in.ko

configname: CONFIG_MACH_WM8505_7IN_NETBOOK

Linux Kernel Configuration
└─>WM8505 7-inch generic netbook
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
Add support for the inexpensive 7-inch netbooks sold by many
Chinese distributors under various names. Note that there are
many hardware implementations in identical exterior, make sure
that yours is indeed based on a WonderMedia WM8505 chip.

source code: