arm64: dts: cavium: thunder-88xx: Add missing PL011 "uartclk"

The PL011 IP has 2 clock inputs for UART core/baud and APB bus. The
Thunder2 SoC is missing the core "uartclk". In this case, the Linux
driver uses single clock for both clock inputs. Let's assume that's how
the h/w is wired and make the DT reflect that.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251216180136.2794105-2-robh@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Author: robherring

arch/arm64/boot/dts/cavium/thunder-88xx.dtsi

@@ -401,16 +401,16 @@
 			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x87e0 0x24000000 0x0 0x1000>;
 			interrupts = <1 21 4>;
-			clocks = <&refclk50mhz>;
-			clock-names = "apb_pclk";
+			clocks = <&refclk50mhz>, <&refclk50mhz>;
+			clock-names = "uartclk", "apb_pclk";
 		};
 
 		uaa1: serial@87e025000000 {
 			compatible = "arm,pl011", "arm,primecell";
 			reg = <0x87e0 0x25000000 0x0 0x1000>;
 			interrupts = <1 22 4>;
-			clocks = <&refclk50mhz>;
-			clock-names = "apb_pclk";
+			clocks = <&refclk50mhz>, <&refclk50mhz>;
+			clock-names = "uartclk", "apb_pclk";
 		};
 	};
 };