arm64: dts: hisi: add refclk node to hip06 dts files for SAS

We will only maintain 1 dts for D03 and there are 50MHz
and 66MHz versions of D03: so we expect UEFI to update
refclk rate in the fdt at boot time.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hip06.dtsi

@@ -318,6 +318,12 @@
 		#size-cells = <2>;
 		ranges;
 
+		refclk: refclk {
+			compatible = "fixed-clock";
+			clock-frequency = <50000000>;
+			#clock-cells = <0>;
+		};
+
 		usb_ohci: ohci@a7030000 {
 			compatible = "generic-ohci";
 			reg = <0x0 0xa7030000 0x0 0x10000>;
@@ -552,6 +558,7 @@
 			ctrl-reset-reg = <0xa60>;
 			ctrl-reset-sts-reg = <0x5a30>;
 			ctrl-clock-ena-reg = <0x338>;
+			clocks = <&refclk 0>;
 			queue-count = <16>;
 			phy-count = <8>;
 			dma-coherent;
@@ -594,6 +601,7 @@
 			ctrl-reset-reg = <0xa18>;
 			ctrl-reset-sts-reg = <0x5a0c>;
 			ctrl-clock-ena-reg = <0x318>;
+			clocks = <&refclk 0>;
 			queue-count = <16>;
 			phy-count = <8>;
 			dma-coherent;
@@ -635,6 +643,7 @@
 			ctrl-reset-reg = <0xae0>;
 			ctrl-reset-sts-reg = <0x5a70>;
 			ctrl-clock-ena-reg = <0x3a8>;
+			clocks = <&refclk 0>;
 			queue-count = <16>;
 			phy-count = <9>;
 			dma-coherent;