econet: en7528: add missing flash partition for DASAN H660GM-A Generic

Add the unnamed partition between rwfs and reservearea to fully describe
the flash layout.

Signed-off-by: Ahmed Naseef <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/22195
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/econet/dts/en7528_dasan_h660gm-a-generic.dts

@@ -81,6 +81,11 @@
 };
 
 &partitions {
+	partition@60c0000 {
+		label = "unknown";
+		reg = <0x60c0000 0xd00000>;
+	};
+
 	partition@6dc0000 {
 		label = "reservearea";
 		reg = <0x6dc0000 0x240000>;