mainboard/jetway/nf81-t56n-lf: Improve diags in romstage

romstage reports a completely unintelligible printf of "error level:",
fix this and document meaning of the return values in source.

Change-Id: Ia2fb9a6206e08822f6c2f62b69bf22cdae2ba819
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5465
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
superio/fintek/f71869ad: Configure multi-func reg in devicetree

Facilitate for the configuration of so called "Multi-function Select
Registers" with devicetree.cb in ramstage.

Make use of this new functionality in, mainboard/jetway/nf81-t56n-lf to
correctly configure the Fintek's multiplexed GPIO pins to be in AMD TSI
mode. This allows the Fintek to correctly talk to the Southbridge over
the SMBus for CPU temperature data as to control fans and so on.

Change-Id: I80abcd8b767fc4b22d00d1384ce4ef89fe837e3d
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5576
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins)
superio/fintek/f71869ad: Make hwm devicetree configurable

Provision the configuration of the Fintek F71869AD Hardware Monitor's
configuration by way of devicetree.cb. Make use of this in the
jetway/nf81-t56n-lf board to properly control fan's.

Change-Id: Ic25b29d1b7a9145e0e209b490b25a2cbc46cb75c
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5580
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>