wlan: Add debugfs interface support for WoWL feature

Add debugfs interface and corresponding support for WoWL feature to WLAN
driver. The feature supports up to 16 WOWL patterns.

CRs-Fixed: 524374
Change-Id: I8a426d06d1f00bed73339c917a3ed28240b6540a
diff --git a/CORE/HDD/inc/wlan_hdd_main.h b/CORE/HDD/inc/wlan_hdd_main.h
index 6bc593f..88a7e41 100644
--- a/CORE/HDD/inc/wlan_hdd_main.h
+++ b/CORE/HDD/inc/wlan_hdd_main.h
@@ -1026,6 +1026,9 @@
 #ifdef FEATURE_WLAN_LPHB
     lphbEnableStruct  lphbEnableReq;
 #endif /* FEATURE_WLAN_LPHB */
+
+    /* debugfs entry */
+    struct dentry *debugfs_phy;
 };