With a bit of a change to PBL ESDHC initialization code it is possible
to share all of the low-level I/O accessor code with the regular
driver, including sharing definitions of flags describing HW's quirks.

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