powerpc/boot/dts: Remove leading 0x and 0s from bindings notation

Improve the DTS files by removing all the leading "0x" and zeros to
fix the following dtc warnings:

  Warning (unit_address_format): Node /XXX unit name should not have leading "0x"

and:

  Warning (unit_address_format): Node /XXX unit name should not have leading 0s

Converted using the following command:

  find . -type f \( -iname *.dts -o -iname *.dtsi \) -exec sed -E -i -e "s/@0x([0-9a-fA-F\.]+)\s?\{/@\L\1 \{/g" -e "s/@0+([0-9a-fA-F\.]+)\s?\{/@\L\1 \{/g" {} +

For simplicity, two sed expressions were used to solve each warnings
separately.

To make the regex expression more robust a few other issues were
resolved, namely setting unit-address to lower case, and adding a
whitespace before the the opening curly brace:

  https://elinux.org/Device_Tree_Linux#Linux_conventions

This is a follow up to commit 4c9847b737 ("dt-bindings: Remove
leading 0x from bindings notation")

Reported-by: David Daney <ddaney@caviumnetworks.com>
Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/boot/dts/mpc836x_mds.dts

@@ -228,7 +228,7 @@
 				gpio-controller;
 			};
 
-			pio1: ucc_pin@01 {
+			pio1: ucc_pin@1 {
 				pio-map = <
 			/* port  pin  dir  open_drain  assignment  has_irq */
 					0  3  1  0  1  0 	/* TxD0 */
@@ -255,7 +255,7 @@
 					2  9  1  0  3  0 	/* GTX_CLK - CLK10 */
 					2  8  2  0  1  0>;	/* GTX125 - CLK9 */
 			};
-			pio2: ucc_pin@02 {
+			pio2: ucc_pin@2 {
 				pio-map = <
 			/* port  pin  dir  open_drain  assignment  has_irq */
 					0  17 1  0  1  0   /* TxD0 */
@@ -393,12 +393,12 @@
 			reg = <0x2120 0x18>;
 			compatible = "fsl,ucc-mdio";
 
-			phy0: ethernet-phy@00 {
+			phy0: ethernet-phy@0 {
 				interrupt-parent = <&ipic>;
 				interrupts = <17 0x8>;
 				reg = <0x0>;
 			};
-			phy1: ethernet-phy@01 {
+			phy1: ethernet-phy@1 {
 				interrupt-parent = <&ipic>;
 				interrupts = <18 0x8>;
 				reg = <0x1>;