Fixes the following W=1 kernel build warning(s):
arch/mips/boot/dts/loongson/ls7a-pch.dtsi:410.7-415.5: Warning (unit_address_vs_reg): /bus@10000000/isa: node has a reg or ranges property, but no unit name
arch/mips/boot/dts/loongson/ls7a-pch.dtsi:410.7-415.5: Warning (simple_bus_reg): /bus@10000000/isa: simple-bus unit address format error, expected "18000000"

Signed-off-by: zhaoxiao <redacted>
---
 arch/mips/boot/dts/loongson/ls7a-pch.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
index f99a7a11fded..d66e1037fba5 100644
--- a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
+++ b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi

@@ -407,7 +407,7 @@
 			};
 		};
 
-		isa {
+		isa@18000000 {
 			compatible = "isa";
 			#address-cells = <2>;
 			#size-cells = <1>;

-- 
2.20.1