CONFIG_ARCH_MSM8916 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Enable support for MSM8916

configname: CONFIG_ARCH_MSM8916

Linux Kernel Configuration
└─>Qualcomm Support
└─>Enable support for MSM8916
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Enable support for the Qualcomm Snapdragon 410 (MSM8916/APQ8016).

Note that ARM64 is the main supported architecture for MSM8916.
The ARM32 option is intended for a few devices with signed firmware
that does not allow booting ARM64 kernels.