qcacld-3.0: Add changes for Napier flow control

Adds support for flow control on convergence branch.
We will have global pool and each vdev coming up will have the
descriptors allocated from global pool. Tx queue is paused and unpaused
internally in host based on the stop and start thresholds.
Changes are added under compilation flag QCA_LL_TX_FLOW_CONTROL_V2.

Change-Id: I0ccb80b0099f39efad52ccd7d47f2709fdee2a93
CRs-Fixed: 2040457

Kbuild

@@ -182,7 +182,7 @@ ifneq ($(CONFIG_ROME_IF),sdio)
 	CONFIG_WLAN_NAPI_DEBUG := n
 
 	# Flag to enable FW based TX Flow control
-	ifeq ($(CONFIG_CNSS_EOS),y)
+	ifeq (y,$(findstring y,$(CONFIG_CNSS_EOS) $(CONFIG_LITHIUM)))
 		CONFIG_WLAN_TX_FLOW_CONTROL_V2 := y
 	else
 		CONFIG_WLAN_TX_FLOW_CONTROL_V2 := n
@@ -1080,6 +1080,9 @@ DP_OBJS := $(DP_SRC)/dp_main.o \
 		$(DP_SRC)/dp_rx_mon_status.o \
 		$(DP_SRC)/dp_rx_defrag.o \
 		$(DP_SRC)/dp_stats.o
+ifeq ($(CONFIG_WLAN_TX_FLOW_CONTROL_V2), y)
+DP_OBJS += $(DP_SRC)/dp_tx_flow_control.o
+endif
 endif
 
 ############ CFG ############