CONFIG_SOC_AM43XX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

TI AM43x

modulename: powerdomains43xx_data.ko

and/or

omap_hwmod_33xx_43xx_interconnect_data.ko

and/or

omap_hwmod_43xx_data.ko

and/or

pm33xx-core.ko

and/or

clockdomains43xx_data.ko

and/or

omap4-restart.ko

and/or

omap_hwmod_33xx_43xx_ipblock_data.ko

configname: CONFIG_SOC_AM43XX

Linux Kernel Configuration
└─>TI AM43x
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
arch/arm/mach-omap2/powerdomains43xx_data.c

depends
CONFIG_ARCH_MULTI_V7 |
| CONFIG_ARCH_MULTI_V6 or CONFIG_ARCH_MULTI_V7

is selected by
CONFIG_VIDEO_AM437X_VPFE