MIPS:DTS:Fix label name and interrupt number of ohci for Loongson-2K

from Loongson-2K1000 user manual know that under pci bus
the device num is 4, function number is 2 and register is 0x2200
is ohci. the ohci interrupt number is 51. because Loongson-2K1000 has
64 interrupt sources, 0-31 correspond to the device tree liointc0 device
 node, and the other correspond to liointc1 node. so it should be
number 19 correspon to liointc1.

Signed-off-by: xiaochuan mao <maoxiaochuan@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Author: xiaochuan mao

arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi

@@ -125,14 +125,14 @@
 				interrupt-parent = <&liointc1>;
 			};
 
-			ehci@4,2 {
+			ohci@4,2 {
 				compatible = "pci0014,7a24.0",
 						   "pci0014,7a24",
 						   "pciclass0c0310",
 						   "pciclass0c03";
 
 				reg = <0x2200 0x0 0x0 0x0 0x0>;
-				interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
+				interrupts = <19 IRQ_TYPE_LEVEL_LOW>;
 				interrupt-parent = <&liointc1>;
 			};