imx: mx6slevk: Add support for USDHC1 and USDHC3 slots
There are three SD/MMC sockets on mx6slevk boards. Implements the
full support for them.
The default boot socket is USDHC2, so the MMC environment is set
to that device.
Signed-off-by: NYe.Li <B37916@freescale.com>
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