bcm4908: backport DTS patch with Ethernet TX IRQ

It allows bcm4908_enet Linux driver to work more efficiently.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 13d9904acd)

target/linux/bcm4908/patches-5.4/032-v5.13-0010-arm64-dts-broadcom-bcm4908-add-Ethernet-TX-irq.patch

@@ -0,0 +1,30 @@
+From 5337af7918bedde9713cd223ce5df74b3d6c7d7a Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Wed, 17 Mar 2021 09:16:31 +0100
+Subject: [PATCH] arm64: dts: broadcom: bcm4908: add Ethernet TX irq
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This hardware supports two interrupts, one per DMA channel (RX and TX).
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
+---
+ arch/arm64/boot/dts/broadcom/bcm4908/bcm4908.dtsi | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+--- a/arch/arm64/boot/dts/broadcom/bcm4908/bcm4908.dtsi
++++ b/arch/arm64/boot/dts/broadcom/bcm4908/bcm4908.dtsi
+@@ -116,8 +116,9 @@
+ 			compatible = "brcm,bcm4908-enet";
+ 			reg = <0x2000 0x1000>;
+ 
+-			interrupts = <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>;
+-			interrupt-names = "rx";
++			interrupts = <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
++				     <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>;
++			interrupt-names = "rx", "tx";
+ 		};
+ 
+ 		usb_phy: usb-phy@c200 {

target/linux/bcm4908/patches-5.4/300-arm64-dts-broadcom-bcm4908-limit-amount-of-GPIOs.patch

@@ -12,7 +12,7 @@ Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
 
 --- a/arch/arm64/boot/dts/broadcom/bcm4908/bcm4908.dtsi
 +++ b/arch/arm64/boot/dts/broadcom/bcm4908/bcm4908.dtsi
-@@ -280,7 +280,7 @@
+@@ -281,7 +281,7 @@
  		gpio0: gpio-controller@500 {
  			compatible = "brcm,bcm6345-gpio";
  			reg-names = "dirout", "dat";