ARM64: dts: meson-gxm: fix q200 interrupt number

Correct the interrupt number assigned to the Realtek PHY in the q200

Fixes: b94d22d9 ("ARM64: dts: meson-gx: add external PHY interrupt on some platforms")
Reported-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>