CONFIG_ARCH_SOCFPGA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_SOCFPGA.
Result is shown for kernelversion 6.9.9

Altera SOCFPGA family

modulename: clk.ko

and/or

clk-pll-a10.ko

configname: CONFIG_ARCH_SOCFPGA

Linux Kernel Configuration
└─>Altera SOCFPGA family
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/clk/socfpga/