qcacmn: Move qdf_walt_get_cpus_taken under WALT_GET_CPU_TAKEN_SUPPORT

qdf_walt_get_cpus_taken under WALT_GET_CPU_TAKEN_SUPPORT feature
flag to avoid compilation failure on branch where changes is not
present.

Change-Id: Iddcc777a476e41cd20fa0ff40ad2dd80af0748ef
CRs-Fixed: 3559247

qdf/linux/src/qdf_threads.c

@@ -357,7 +357,7 @@ qdf_cpumask_complement(qdf_cpu_mask *dstp, const qdf_cpu_mask *srcp)
 
 qdf_export_symbol(qdf_cpumask_complement);
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(6, 1, 0))
+#ifdef WALT_GET_CPU_TAKEN_SUPPORT
 qdf_cpu_mask qdf_walt_get_cpus_taken(void)
 {
 	return walt_get_cpus_taken();