mips: dts: realtek: Correct uart interrupt-parent
The uart interrupts on RTL838x chips do not lead to the CPU's interrupt
controller directly, but passes via the SoC interrupt controller. Update
the interrupt-parent property to fix this.
Signed-off-by: Sander Vanheule <sander@svanheule.net>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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