GPIO interrupts are used for the external Ethernet RGMII PHY interrupt
line.
Add the GPIO interrupt controller so we can describe that connection in
the dts files.
Signed-off-by: NMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NKevin Hilman <khilman@baylibre.com>