arm64: dts: meson-g12a-sei510: bump bluetooth bus speed to 2Mbaud/s

Setting to 2Mbaud/s is the nominal bus speed for common usages.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm64/boot/dts/amlogic/meson-g12a-sei510.dts

@@ -275,6 +275,7 @@ &uart_A {
 	bluetooth {
 		compatible = "brcm,bcm43438-bt";
 		shutdown-gpios = <&gpio GPIOX_17 GPIO_ACTIVE_HIGH>;
+		max-speed = <2000000>;
 		clocks = <&wifi32k>;
 		clock-names = "lpo";
 		vbat-supply = <&vddao_3v3>;