default or selected kernelversion does not have config value CONFIG_I2C_RPXLITE.
Result is shown for kernelversion 5.15.113

Embedded Planet RPX Lite/Classic support

modulename: i2c-rpx.ko

configname: CONFIG_I2C_RPXLITE

Linux Kernel Configuration
└─>Device Drivers
└─>I2C support
└─>I2C Hardware Bus support
└─>Embedded Planet RPX Lite/Classic support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
drivers/i2c/busses//i2c-rpx.c