ARM: dts: e60k02: fix aliases for mmc

Since commit fa2d0aa9
("mmc: core: Allow setting slot index via device tree alias")
mmc numbering are changed, confusing boot scripts. Fix that by adding
proper aliases

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>