CONFIG_ARCH_STRATIX10 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Altera's Stratix 10 SoCFPGA Family

configname: CONFIG_ARCH_STRATIX10

Linux Kernel Configuration
└─>Platform selection
└─>Altera's Stratix 10 SoCFPGA Family
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This enables support for Altera's Stratix 10 SoCFPGA Family.

is selected by
CONFIG_DWMAC_SOCFPGA