Change i.MX2/i.MX3/i.MX5 SoCs esdhc node name from esdhc to mmc to
be compliant with yaml schema, it requires the nodename to be "mmc".
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>