qcacmn: Add stop_th and start_th for tx flow control V1

Add stop_th and start_th for QCA_LL_TX_FLOW_CONTROL_V2 disabled
platform, which is pdev based tx_desc pool. Change pdev tx_desc pool
size from 1056 to 900, default stop_th is 15% start_th is 25%, this
setting is exactly same as QCA_LL_TX_FLOW_CONTROL_V2. Pause netif tx
queues for all vdevs when stop_th reached instead of dropping frames.
Reduce pdev pool size could significantly reduce firmware wmm drop. Both
of host and firmware frame dropps lead to bad TCP throughput.

Change-Id: I77daf8c9fdef624f8ec479885b7705deb1fef142
CRs-Fixed: 2437471

dp/inc/cdp_txrx_mob_def.h

@@ -286,12 +286,10 @@ struct txrx_pdev_cfg_param_t {
 	bool enable_rxthread;
 	/* CE classification enabled through INI */
 	bool ce_classify_enabled;
-#ifdef QCA_LL_TX_FLOW_CONTROL_V2
 	/* Threshold to stop queue in percentage */
 	uint32_t tx_flow_stop_queue_th;
 	/* Start queue offset in percentage */
 	uint32_t tx_flow_start_queue_offset;
-#endif
 
 	struct ol_tx_sched_wrr_ac_specs_t ac_specs[TX_WMM_AC_NUM];
 	bool gro_enable;