qcacmn: Add Link stats check before ring access directly

Throughput based RTPM logic of ring access may fail and
lead to NOC error in some corner cases. Change is aimed
to add additional link states check to prevent invalid SRNG
access.

Change-Id: I7e7edbadfd21b4857efa4faff0ada6d94d682f2c
CRs-Fixed: 3256702

hif/src/hif_runtime_pm.c

@@ -1025,6 +1025,11 @@ void hif_rtpm_set_state(enum hif_rtpm_state state)
 	qdf_atomic_set(&gp_hif_rtpm_ctx->pm_state, state);
 }
 
+int hif_rtpm_get_state(void)
+{
+	return qdf_atomic_read(&gp_hif_rtpm_ctx->pm_state);
+}
+
 int hif_pre_runtime_suspend(struct hif_opaque_softc *hif_ctx)
 {
 	if (!hif_can_suspend_link(hif_ctx)) {