mips: dts: brcm: bcm7435: add "interrupt-names" for NAND controller

Second interrupt can be DMA or EDU one. Specify it explicitly using
interrupt-names property. This matches documented binding.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/boot/dts/brcm/bcm7435.dtsi

@@ -422,6 +422,7 @@
 			reg = <0x41c800 0x600>, <0x41d000 0x100>;
 			interrupt-parent = <&hif_l2_intc>;
 			interrupts = <24>, <4>;
+			interrupt-names = "nand_ctlrdy", "flash_dma_done";
 			status = "disabled";
 		};