'interrupt-parent' should contain just the phandle of the node
interrupts are sent to.
This node (gic: interrupt-controller@f9010000) doesn't generate any
interrupts, so the 'interrupt-parent' value is never used (this is why
it wasn't caught). It'll give an error later with 'interrupt-parent'
declared as 'type: phandle' in bindings though.
Don't know what was intended. Just remove the 0.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>