The I2C_MULTI_BUS needs to be defined for correct I2C operation with
many software emulated I2C controllers.
This fix restores correct value of the I2C_MULTI_BUS changed by following
commit:
SHA1: 
385c9ef5a7215b2b0c22836fee6c692dfc8559d7
i2c: add i2c_core and prepare for new multibus support
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Cc: Heiko Schocher <hs@denx.de>
 # if !defined(CONFIG_SYS_MAX_I2C_BUS)
 #  define CONFIG_SYS_MAX_I2C_BUS               2
 # endif
-# define I2C_MULTI_BUS                         0
+# define I2C_MULTI_BUS                         1
 #else
 # define CONFIG_SYS_MAX_I2C_BUS                1
 # define I2C_MULTI_BUS                         0