CONFIG_MACH_EDB9315 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Support Cirrus Logic EDB9315

modulename: edb9315.ko

configname: CONFIG_MACH_EDB9315

Linux Kernel Configuration
└─>Cirrus EP93xx Implementation Options
└─>Support Cirrus Logic EDB9315
In linux kernel since version 2.6.18 (release Date: 2006-09-19)  
Say 'Y' here if you want your kernel to support the Cirrus
Logic EDB9315 Evaluation Board.

source code:
arch/arm/mach-ep93xx/edb9315.c