ARM: dts: BCM5301X: fix duplex-full => full-duplex

this typo was found by the dtbs_check
| ports:port@5:fixed-link: 'oneOf' conditional failed,
|  {'speed': [[1000]], 'duplex-full': True} is not of type 'array'
| 'duplex-full' does not match any of the regexes: 'pinctrl-[0-]..."

this should have been full-duplex;

Fixes: 935327a7 ("ARM: dts: BCM5301X: Add DT for Meraki MR26")
Fixes: ec88a9c3 ("ARM: BCM5301X: Add DT for Meraki MR32")
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Link: https://lore.kernel.org/r/50522f45566951a9eabd22820647924cc6b4a264.1686238550.git.chunkeey@gmail.comSigned-off-by: Florian Fainelli <florian.fainelli@broadcom.com>

arch/arm/boot/dts/bcm53015-meraki-mr26.dts

@@ -121,7 +121,7 @@ port@5 {
 
 			fixed-link {
 				speed = <1000>;
-				duplex-full;
+				full-duplex;
 			};
 		};
 	};

arch/arm/boot/dts/bcm53016-meraki-mr32.dts

@@ -182,7 +182,7 @@ port@5 {
 
 			fixed-link {
 				speed = <1000>;
-				duplex-full;
+				full-duplex;
 			};
 		};
 	};