uboot-imx

omap_hsmmc: introduce omap_hsmmc_data struct

Currently there's no appropriate place to store driver specific data
because the pointer that is meant for that (priv) is being used to
store the base address of mmc registers.

Introduce a new struct for storing driver specific data.

Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>