ipq40xx: specify "firmware" partition format for EnGenius EAP1300

Specify firmware partition format by compatible string.

Cc: Steven Lin <steven.lin@senao.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-eap1300.dts

@@ -192,6 +192,7 @@
 				read-only;
 			};
 			partition8@190000 {
+				compatible = "denx,fit";
 				label = "firmware";
 				reg = <0x190000 0x1dc0000>;
 			};