clk: mvebu: Use of_get_cpu_hwid() to read CPU ID

Use of_get_cpu_hwid() rather than the open coded reading of the CPU
nodes "reg" property. The existing code is in fact wrong as the "reg"
address cells size is 2 cells for arm64. The existing code happens to
work because the DTS files are wrong as well.
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230327-mvebu-clk-fixes-v2-2-8333729ee45d@kernel.orgSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/mvebu/ap-cpu-clk.c

@@ -253,12 +253,12 @@ static int ap_cpu_clock_probe(struct platform_device *pdev)
 	 */
 	nclusters = 1;
 	for_each_of_cpu_node(dn) {
-		int cpu, err;
+		u64 cpu;
 
-		err = of_property_read_u32(dn, "reg", &cpu);
-		if (WARN_ON(err)) {
+		cpu = of_get_cpu_hwid(dn, 0);
+		if (WARN_ON(cpu == OF_BAD_ADDR)) {
 			of_node_put(dn);
-			return err;
+			return -EINVAL;
 		}
 
 		/* If cpu2 or cpu3 is enabled */
@@ -288,12 +288,12 @@ static int ap_cpu_clock_probe(struct platform_device *pdev)
 		struct clk_init_data init;
 		const char *parent_name;
 		struct clk *parent;
-		int cpu, err;
+		u64 cpu;
 
-		err = of_property_read_u32(dn, "reg", &cpu);
-		if (WARN_ON(err)) {
+		cpu = of_get_cpu_hwid(dn, 0);
+		if (WARN_ON(cpu == OF_BAD_ADDR)) {
 			of_node_put(dn);
-			return err;
+			return -EINVAL;
 		}
 
 		cluster_index = cpu & APN806_CLUSTER_NUM_MASK;