ARM: dts: imx7d-sdb: Add Bluetooth support

imx7d-sdb has a BCM4339 BT chip connected to UART6.

Add support for it.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7d-sdb.dts

@@ -370,6 +370,15 @@ &uart1 {
 	status = "okay";
 };
 
+&uart6 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_uart6>;
+	assigned-clocks = <&clks IMX7D_UART6_ROOT_SRC>;
+	assigned-clock-parents = <&clks IMX7D_PLL_SYS_MAIN_240M_CLK>;
+	uart-has-rtscts;
+	status = "okay";
+};
+
 &usbotg1 {
 	vbus-supply = <&reg_usb_otg1_vbus>;
 	status = "okay";