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

ARM Ltd. RealView family

modulename: clk-realview.ko

and/or

irq-gic-realview.ko

configname: CONFIG_ARCH_REALVIEW

ARM system type
└─>ARM Ltd. RealView family
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
This enables support for ARM Ltd RealView boards.

source code:
drivers/clk/versatile/clk-realview.c