ARM: dts: meson: fixing USB support on Meson6, Meson8 and Meson8b

This patch fixes the Meson6, Meson8 and Meson8b USB controllers dts nodes
which interrupts are level type instead of edge type.
This avoids errors like "usb 1-1-port1: cannot reset (err = -110)" and
similars on Odroid-C1+ board.

Fixes: e29b1cf8 ("ARM: dts: meson: add USB support on Meson8 and Meson8b")

Signed-off-by: Emiliano Ingrassia <ingrassia@epigenesys.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>