qcacmn: Change tx_desc, desc_ext min threshold

For DBS SAP case, need to balance the CPU cost and
TPUT KPI, use tx_descriptor size to control this can
in avoid the influence of IPA part.

CRs-Fixed: 2665268
Change-Id: I702a605b7a3156e429476f6a4d623b69bb19f615

wlan_cfg/cfg_dp.h

@@ -118,10 +118,10 @@
 #define WLAN_CFG_TX_COMP_RING_SIZE_MIN 512
 #define WLAN_CFG_TX_COMP_RING_SIZE_MAX 0x80000
 
-#define WLAN_CFG_NUM_TX_DESC_MIN  1024
+#define WLAN_CFG_NUM_TX_DESC_MIN  16
 #define WLAN_CFG_NUM_TX_DESC_MAX  32768
 
-#define WLAN_CFG_NUM_TX_EXT_DESC_MIN  1024
+#define WLAN_CFG_NUM_TX_EXT_DESC_MIN  16
 #define WLAN_CFG_NUM_TX_EXT_DESC_MAX  0x80000
 
 #define WLAN_CFG_INT_BATCH_THRESHOLD_TX_MIN 1