arm64: dts: zynqmp: Use serdev for zcu100 BT

Mainline started to use serdev interface for uart attached devices.
Change description to reflect it.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm64/boot/dts/xilinx/zynqmp-zcu100-revC.dts

@@ -89,12 +89,6 @@
 			gpios = <&gpio 25 GPIO_ACTIVE_HIGH>;
 			default-state = "on";
 		};
-
-		bt_power {
-			label = "bt_power";
-			gpios = <&gpio 8 GPIO_ACTIVE_HIGH>;
-			default-state = "on";
-		};
 	};
 
 	wmmcsdio_fixed: fixedregulator-mmcsdio {
@@ -267,6 +261,10 @@
 
 &uart0 {
 	status = "okay";
+	bluetooth {
+		compatible = "ti,wl1831-st";
+		enable-gpios = <&gpio 8 GPIO_ACTIVE_HIGH>;
+	};
 };
 
 &uart1 {