ARM: dts: da850: Fix interrups property for gpio

The intc #interrupt-cells is equal to 1. Currently gpio
node has 2 cells per IRQ which is wrong. Remove the additional
cell for each of the interrupts.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Fixes: 2e38b946 ("ARM: davinci: da850: add GPIO DT node")
Signed-off-by: Sekhar Nori <nsekhar@ti.com>