driver/i2c/mxc: Enable I2C bus 3 and 4
Some SoCs have more than two I2C busses. Instead of adding ifdef
to the driver, macros are put into board header file where
CONFIG_SYS_I2C_MXC is defined.
Signed-off-by:
York Sun <yorksun@freescale.com>
CC: Heiko Schocher <hs@denx.de>
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