arm64: zynqmp: Add pinctrl description for all boards

The commit 1dccb5ec ("dt-bindings: pinctrl: Add binding for ZynqMP
pinctrl driver") and commit 8b242ca7 ("pinctrl: Add Xilinx ZynqMP
pinctrl driver support") add support for Xilinx ZynqMP pinctrl driver
that's why describe pins configuration for current boards.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/d8bc42600da85f5a23d977d4b61e6528720573e5.1623684253.git.michal.simek@xilinx.com