CONFIG_S3C_DEV_I2C2 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C_DEV_I2C2 (not configurable)

modulename: dev-i2c2.ko

configname: CONFIG_S3C_DEV_I2C2

Linux Kernel Configuration
└─>S3C_DEV_I2C2
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Compile in platform device definitions for I2C channel 2

source code: