arm: mvebu: mvebu_armada-8k: drop Puzzle M801 early init code

Since the CP1 pinctrl is not properly set in the DTS, there is no
need for setting the pinctrl by writing hardcoded values to the MPP
registers.

So, drop the code relating to that.

Fixes: 87c220d0 ("arm: mvebu: mvebu_armada-8k: Add support for initializing iEi Puzzle-M801 networking")
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Stefan Roese <sr@denx.de>