arm: mvebu: dts: m801: correct CP1 pinctrl

Current CP1 pinctrl that is set on the Puzzle M801 is incorrect.
CP1 pins are only used for the SMI bus and the MSS I2C, all other
pins are just GPIO-s.

Due to this being set completely wrong, the pinctrl was actually
ended up being hardcoded in the board_early_init_f() step so that
SMI would work.

That is obviously not the right thing to do, so convert the register
hex values that were being written to individual pin modes and set it
in the DTS.
Add the SMI pins to the CP1 MDIO node as otherwise CP1 pinctrl does
not get probed without an consumer.

Fixes: 2ae2b8a2 ("arm: mvebu: Initial iEi Puzzle-M801 support")
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Stefan Roese <sr@denx.de>