mxc nand: Let driver detect IP revision

There is no reason to have board configs to select the NFC IP revision. Just let
the driver detect it. BTW, remove broken NFC IP revision configs from board
config files.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>
4 files changed