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/lantiq/files-4.14/arch/mips/boot/dts/ARV4519PW.dts

@@ -181,7 +181,7 @@
 	};
 };
 
-&pci0  {
+&pci0 {
 	status = "okay";
 	lantiq,external-clock;
 	gpio-reset = <&gpio 21 GPIO_ACTIVE_HIGH>;