treewide: fix some cosmetic glitches in dts files

- fix single spaces hidden by a tab
- replace indentation with spaces by tabs
- make empty lines empty
- drop trailing whitespace
- drop unnecessary blank lines

Signed-off-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Paul Wassi <p.wassi@gmx.at>

target/linux/brcm63xx/dts/dgnd3700v1.dts

@@ -119,7 +119,7 @@
 			reg = <0x1fe0000 0x20000>;
 		};
 	};
-}; 
+};
 
 &pinctrl {
 	pinctrl-names = "default";