IMX: novena: remove CONFIG_I2C_MXC

This macro is defined, but not referenced by anyone.

I did not touch config_whitelist.txt - the CONFIG will be dropped
by the next re-sync.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Heiko Schocher<hs@denx.de>

include/configs/novena.h

@@ -80,7 +80,6 @@
 #define CONFIG_SYS_I2C_MXC_I2C2		/* enable I2C bus 2 */
 #define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_I2C_MULTI_BUS
-#define CONFIG_I2C_MXC
 #define CONFIG_SYS_I2C_SPEED		100000
 #define CONFIG_SYS_SPD_BUS_NUM		0