Simplify OCOTP field packing/unpacking with macros from
<linux/bitfield.h>.

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>

There is no reason why code handling MAC-address properties of
"ocotp0" and code fetching this information to pass it along to
networking subsystem couldn't share majority of their code. Convert
the driver to do that.

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>

Add imx_ocotp_sense_enable() function to allow changing that aspect of
OCOTP driver behaviour before calling imx_ocotp_read_field()

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

Add functions to access the OCOTP fuses field wise, similar to what has
been done for the IIM. Also add a i.MX6 fusemap header file.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>