CONFIG_MCU_MPC8349EMITX is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

MPC8349E-mITX MCU driver

modulename: mcu_mpc8349emitx.ko

configname: CONFIG_MCU_MPC8349EMITX

Linux Kernel Configuration
└─>Platform support
└─>MPC8349E-mITX MCU driver
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
Say Y here to enable soft power-off functionality on the Freescale
boards with the MPC8349E-mITX-compatible MCU chips. This driver will
also register MCU GPIOs with the generic GPIO API, so you'll able
to use MCU pins as GPIOs.

source code: