CONFIG_RTC_DRV_SUN4V is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

SUN4V Hypervisor RTC

modulename: rtc-sun4v.ko

configname: CONFIG_RTC_DRV_SUN4V

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>SUN4V Hypervisor RTC
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
If you say Y here you will get support for the Hypervisor
based RTC on SUN4V systems.

source code: