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

Palm Tungsten|C

modulename: palmtc.ko

and/or

pxa2xx_palmtc.ko

configname: CONFIG_MACH_PALMTC

Linux Kernel Configuration
└─>Intel PXA2xx/PXA3xx Implementations
└─>Palm Tungsten|C
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Say Y here if you intend to run this kernel on a Palm Tungsten|C
handheld computer.

source code:
arch/arm/mach-pxa/palmtc.c
selects
CONFIG_PXA25x