riscv: dts: thead: Add APB clocks for TH1520 GMACs

Describe perisys-apb4-hclk as the APB clock for TH1520 SoC, which is
essential for accessing GMAC glue registers.

Fixes: 7e75667 ("riscv: dts: thead: Add TH1520 ethernet nodes")
Signed-off-by: Yao Zi <[email protected]>
Reviewed-by: Drew Fustini <[email protected]>
Tested-by: Drew Fustini <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: ziyao233

arch/riscv/boot/dts/thead/th1520.dtsi

@@ -297,8 +297,9 @@
 			reg-names = "dwmac", "apb";
 			interrupts = <67 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "macirq";
-			clocks = <&clk CLK_GMAC_AXI>, <&clk CLK_GMAC1>;
-			clock-names = "stmmaceth", "pclk";
+			clocks = <&clk CLK_GMAC_AXI>, <&clk CLK_GMAC1>,
+				 <&clk CLK_PERISYS_APB4_HCLK>;
+			clock-names = "stmmaceth", "pclk", "apb";
 			snps,pbl = <32>;
 			snps,fixed-burst;
 			snps,multicast-filter-bins = <64>;
@@ -319,8 +320,9 @@
 			reg-names = "dwmac", "apb";
 			interrupts = <66 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "macirq";
-			clocks = <&clk CLK_GMAC_AXI>, <&clk CLK_GMAC0>;
-			clock-names = "stmmaceth", "pclk";
+			clocks = <&clk CLK_GMAC_AXI>, <&clk CLK_GMAC0>,
+				 <&clk CLK_PERISYS_APB4_HCLK>;
+			clock-names = "stmmaceth", "pclk", "apb";
 			snps,pbl = <32>;
 			snps,fixed-burst;
 			snps,multicast-filter-bins = <64>;