CONFIG_I2C_BITBANG_8815NHK is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Driver for bit-bang busses found on the 8815 NHK

modulename: i2c-8815nhk.ko

configname: CONFIG_I2C_BITBANG_8815NHK

Linux Kernel Configuration
└─>Driver for bit-bang busses found on the 8815 NHK
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
source code:
arch/arm/mach-nomadik/i2c-8815nhk.c