3c1eaec012
dtc is showing some warnings and this change was also done in the Linux kernel as "Input: gpio-keys - clean up device tree binding example" with this fragment in commit message "Drop #address-cells and #size-cells, which are not required by the gpio-keys binding documentation, as button sub-nodes are not devices." Signed-off-by: Michal Simek <michal.simek@xilinx.com>