Documentation: devicetree: Clean up gpio-keys example

Drop #address-cells and #size-cells, which are not required by the
gpio-keys binding documentation, as button sub-nodes are not devices.

Rename sub-nodes to avoid new dtc unit address warnings when copied.

While at it, adopt the dashes convention for the node name.

Reported-by: Julien Chauveau <[email protected]>
Cc: Julien Chauveau <[email protected]>
Cc: Javier Martinez Canillas <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Signed-off-by: Andreas Färber <[email protected]>
Reviewed-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Julien Chauveau <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

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