ARM: hisilicon: hikey: dts: Add pl011 additional clock binding.

This is a binding which only exists in U-Boot, but is
required to get working serial in U-Boot.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/dts/hi6220.dtsi

@@ -166,6 +166,7 @@
 			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x0 0xf8015000 0x0 0x1000>;
 			interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
+			clock = <19200000>;
 			clocks = <&ao_ctrl HI6220_UART0_PCLK>,
 				 <&ao_ctrl HI6220_UART0_PCLK>;
 			clock-names = "uartclk", "apb_pclk";
@@ -175,6 +176,7 @@
 			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x0 0xf7111000 0x0 0x1000>;
 			interrupts = <GIC_SPI 37 IRQ_TYPE_LEVEL_HIGH>;
+			clock = <19200000>;
 			clocks = <&sys_ctrl HI6220_UART1_PCLK>,
 				 <&sys_ctrl HI6220_UART1_PCLK>;
 			clock-names = "uartclk", "apb_pclk";
@@ -185,6 +187,7 @@
 			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x0 0xf7112000 0x0 0x1000>;
 			interrupts = <GIC_SPI 38 IRQ_TYPE_LEVEL_HIGH>;
+			clock = <19200000>;
 			clocks = <&sys_ctrl HI6220_UART2_PCLK>,
 				 <&sys_ctrl HI6220_UART2_PCLK>;
 			clock-names = "uartclk", "apb_pclk";
@@ -195,6 +198,7 @@
 			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x0 0xf7113000 0x0 0x1000>;
 			interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
+			clock = <19200000>;
 			clocks = <&sys_ctrl HI6220_UART3_PCLK>,
 				 <&sys_ctrl HI6220_UART3_PCLK>;
 			clock-names = "uartclk", "apb_pclk";
@@ -204,6 +208,7 @@
 			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x0 0xf7114000 0x0 0x1000>;
 			interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
+			clock = <19200000>;
 			clocks = <&sys_ctrl HI6220_UART4_PCLK>,
 				 <&sys_ctrl HI6220_UART4_PCLK>;
 			clock-names = "uartclk", "apb_pclk";