qcacmn: Check tx completions pending before disabling pipes

wlan Tx completions doorbell is rung after IPA pipes are disabled
To fix this, Check if tx completions are pending before disable IPA
pipes.

Change-Id: I1903e593cd6a546a277979073f0a9ba62b681644
CRs-Fixed: 2796989

dp/wifi3.0/dp_ipa.h

@@ -24,6 +24,10 @@
 #define IPA_REO_DEST_RING_IDX	3
 #define IPA_RX_REFILL_BUF_RING_IDX	2
 
+/* Adding delay before disabling ipa pipes if any Tx Completions are pending */
+#define TX_COMP_DRAIN_WAIT_MS	50
+#define TX_COMP_DRAIN_WAIT_TIMEOUT_MS	200
+
 /**
  * struct dp_ipa_uc_tx_hdr - full tx header registered to IPA hardware
  * @eth:     ether II header