arm64: dts: renesas: beacon kit: Fix choppy Bluetooth Audio

stable inclusion
from stable-5.10.20
commit 072552f973ad1143e296f858a820d64c20b53821
bugzilla: 50608

--------------------------------

[ Upstream commit db030c5a ]

The Bluetooth chip is capable of operating at 4Mbps, but the
max-speed setting was on the UART node instead of the Bluetooth
node, so the chip didn't operate at the correct speed resulting
in choppy audio.  Fix this by setting the max-speed in the proper
node.

Fixes: a1d8a344 ("arm64: dts: renesas: Introduce r8a774a1-beacon-rzg2m-kit")
Signed-off-by: NAdam Ford <aford173@gmail.com>
Link: https://lore.kernel.org/r/20201213183759.223246-3-aford173@gmail.comSigned-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/boot/dts/renesas/beacon-renesom-som.dtsi

@@ -88,7 +88,6 @@
 	pinctrl-names = "default";
 	uart-has-rtscts;
 	status = "okay";
-	max-speed = <4000000>;
 
 	bluetooth {
 		compatible = "brcm,bcm43438-bt";
@@ -97,6 +96,7 @@
 		device-wakeup-gpios = <&pca9654 5 GPIO_ACTIVE_HIGH>;
 		clocks = <&osc_32k>;
 		clock-names = "extclk";
+		max-speed = <4000000>;
 	};
 };