ARM: dts: mmp2: fix the gpio interrupt cell number

[ Upstream commit 40058398

 ]

gpio-pxa uses two cell to encode the interrupt source: the pin number
and the trigger type. Adjust the device node accordingly.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>