qcacld-3.0: Use QDF API qdf_set_wake_up_idle in rx thread

To avoid conditional compilation inside function body use QDF API
qdf_set_wake_up_idle in RX thread startup api.

Change-Id: Ibe78fb19893c6a942cfbdde2f33684ea402af47b
CRs-Fixed: 2580958

core/cds/src/cds_sched.c

@@ -797,9 +797,7 @@ static int cds_ol_rx_thread(void *arg)
 	set_user_nice(current, -1);
 #endif
 
-#ifdef MSM_PLATFORM
-	set_wake_up_idle(true);
-#endif
+	qdf_set_wake_up_idle(true);
 
 	complete(&pSchedContext->ol_rx_start_event);