CONFIG_ARCH_SIRF is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_SIRF.
Result is shown for kernelversion 6.9.2

CSR SiRF

modulename: clk-prima2.ko

configname: CONFIG_ARCH_SIRF

Linux Kernel Configuration
└─>CSR SiRF
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Support for CSR SiRFprimaII/Marco/Polo platforms

source code: