Nether esdhc_setup_data() nor esdhc_do_data() really need struct
mci_host, so we can drop a bit of extra type conversion code by
changing their signature to accept struct fsl_esdhc_host instead

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>