arm64: dts: meson: sm1: set gpio interrupt controller compatible

Set the appropriate gpio interrupt controller compatible for the
sm1 SoC family. This newer version of the controller can now
trig irq on both edge of the input signal

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>