For reasons unclear VFxxx port of U-Boot chose to store MAC address in
OCOTP using a layout that is incompatible with rest of i.MX
world (both in U-Boot and Barebox). Unfortunately for us, that means
that there are a number of boards out there that have had their MAC
addresses programmed using U-Boot and in order to properly support
those boards we need to change VFxxx port of Barebox to be compatible.

Since the number of Barebox users on VFxx is in single digits, just
chage the layout to that of U-Boot without trying to make this a
configurable option.

Cc: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Tested-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>