CONFIG_ARCH_MSM8974 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Enable support for MSM8974

configname: CONFIG_ARCH_MSM8974

Linux Kernel Configuration
└─>Qualcomm Support
└─>Enable support for MSM8974
In linux kernel since version 3.14 (release Date: 2014-03-30)