CONFIG_SOC_SAMV7 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

SAM Cortex-M7 family

modulename: samv7.ko

configname: CONFIG_SOC_SAMV7

Linux Kernel Configuration
└─>Atmel SoCs
└─>SAM Cortex-M7 family
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Select this if you are using an SoC from Atmel's SAME7, SAMS7 or SAMV7
families.

source code: