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

Motorola EZX Platform

modulename: ezx.ko

configname: CONFIG_PXA_EZX

Linux Kernel Configuration
└─>PXA2xx/PXA3xx-based
└─>Intel PXA2xx/PXA3xx Implementations
└─>Motorola EZX Platform
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
source code:
arch/arm/mach-pxa/ezx.c