arm64: zynqmp: Remove pinctrl settings

This part hasn't been pushed to mainline yet that's why remove it.
The patch can be reverted in future when this is pushed there.

Reported-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Alexander Graf <agraf@suse.de>