ARM: dts: meson: correct the sort order for the the gpio_intc node

Nodes are sorted by their register start address. Move gpio_intc to the
correct position.
No functional changes intended.

Fixes: 7d32bc03

 ("ARM: dts: meson8b: enable gpio interrupt controller")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>