fsa9480: Delete legacy Samsung i2c driver
modified:   drivers/i2c/chips/Kconfig
modified:   drivers/i2c/chips/Makefile
deleted:    drivers/i2c/chips/fsa9480.c
deleted:    include/linux/i2c/fsa9480.h
Signed-off-by: cholokei <leesl0416@naver.com>