ARM: dts: ebaz4205: add pinctrl entries for switches

Add the pinctrl entries for the GPIOs which are connected to the
push buttons on this board.

Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20210201133000.23402-1-michael@walle.cc


Signed-off-by: Michal Simek <michal.simek@xilinx.com>