bcm53xx: drop downstream patch that now breaks pinctrl driver

This fixes:
[    0.292536] ns-pinmux 1800c100.cru:pinctrl: invalid resource
[    0.298322] ns-pinmux 1800c100.cru:pinctrl: Failed to map pinctrl regs
[    0.305578] ns-pinmux: probe of 1800c100.cru:pinctrl failed with error -22

Linux 5.4.157 included commit 6d0b30784fcd9 ("Revert "pinctrl: bcm: ns:
support updated DT binding as syscon subnode"") which makes pinctrl
driver expect the old DT syntax.
Drop downstream patch switching pinctrl node to the invalidated syntax.

Fixes: 0b7311300b ("kernel: bump 5.4 to 5.4.158")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

target/linux/bcm53xx/patches-5.4/302-ARM-dts-BCM5301X-Update-Northstar-pinctrl-binding.patch

@@ -1,31 +0,0 @@
-From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
-Subject: [PATCH] ARM: dts: BCM5301X: Update Northstar pinctrl binding
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
----
-
---- a/arch/arm/boot/dts/bcm5301x.dtsi
-+++ b/arch/arm/boot/dts/bcm5301x.dtsi
-@@ -424,16 +424,12 @@
- 		#size-cells = <1>;
- 
- 		cru@100 {
--			compatible = "simple-bus";
-+			compatible = "syscon", "simple-mfd";
- 			reg = <0x100 0x1a4>;
--			ranges;
--			#address-cells = <1>;
--			#size-cells = <1>;
- 
--			pinctrl: pin-controller@1c0 {
-+			pinctrl: pinctrl {
- 				compatible = "brcm,bcm4708-pinmux";
--				reg = <0x1c0 0x24>;
--				reg-names = "cru_gpio_control";
-+				offset = <0xc0>;
- 
- 				spi-pins {
- 					groups = "spi_grp";