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/bcm963269bhr.dts

@@ -25,7 +25,7 @@
 			gpios = <&pinctrl 32 0>;
 			linux,code = <KEY_RESTART>;
 		};
-        };
+	};
 
 	gpio-leds {
 		compatible = "gpio-leds";