arm64: dts: hikey: Add DMA entries for Bluetooth UART

Add dma0 references for bluetooth uart to enable dma
for bt transfers.

Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Ryan Grachek <ryan@edited.us>
Cc: Wei Xu <xuwei5@hisilicon.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: devicetree@vger.kernel.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi6220.dtsi

@@ -319,6 +319,8 @@ uart1: uart@f7111000 {
 			clock-names = "uartclk", "apb_pclk";
 			pinctrl-names = "default";
 			pinctrl-0 = <&uart1_pmx_func &uart1_cfg_func1 &uart1_cfg_func2>;
+			dmas = <&dma0 8 &dma0 9>;
+			dma-names = "rx", "tx";
 			status = "disabled";
 		};