qcacld-3.0: Revise to include walt.h header

Since walt is msm-only scheduler group of features,
not upstreamed. Include walt.h header when CONFIG_SCHED_WALT
has been enabled.

CRs-Fixed: 3023911
Change-Id: I7f334952fd624606b9ddf1b53237cea52628abbb

core/hdd/src/wlan_hdd_ipa.c

@@ -30,7 +30,9 @@
 #include <wlan_hdd_softap_tx_rx.h>
 #include <linux/inetdevice.h>
 #include <qdf_trace.h>
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)
+/* Test against msm kernel version */
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)) && \
+	IS_ENABLED(CONFIG_SCHED_WALT)
 #include <linux/sched/walt.h>
 #endif