configs: odroid-xu3: remove the CONFIG_I2C_COMPAT

Remove the CONFIG_I2C_COMPAT, instead enable the CONFIG_SYS_I2C_S3C24X0.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>