ipq40xx: GL-B1300: convert to new partitions layout

Alberto Bursi reported:
>The patch "ipq40xx: specify "firmware" partition format for GL.iNet GL-B1300"
>prevents boot on my B1300. I compiled from latest sources.

The GL-B1300 was using the discouraged direct subnodes method to declare
the partitions on the flash.

|The partition table should be a subnode of the flash node and should be named
|'partitions'. This node should have the following property:
|- compatible : (required) must be "fixed-partitions"
|Partitions are then defined in subnodes of the partitions node.
|
|For backwards compatibility partitions as direct subnodes of the flash device are
|supported. This use is discouraged.
|NOTE: also for backwards compatibility, direct subnodes that have a compatible
|string are not considered partitions, as they may be used for other bindings.
<https://www.kernel.org/doc/Documentation/devicetree/bindings/mtd/partition.txt>

Hence, this patch converts the device to the "partitions" layout.

Fixes: 1cbe457cf9 ("ipq40xx: specify "firmware" partition format for GL.iNet GL-B1300")
Reported-by: Alberto Bursi <bobafetthotmail@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4029-gl-b1300.dts

@@ -155,6 +155,11 @@
 		reg = <0>;
 		spi-max-frequency = <24000000>;
 
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
 			SBL1@0 {
 				label = "SBL1";
 				reg = <0x0 0x40000>;
@@ -209,6 +214,7 @@
 				reg = <0x180000 0x1e80000>;
 			};
 		};
+	};
 };
 
 &blsp1_uart1 {