qcacld-3.0: Enabling per vdev tx descriptor pool

Change to enable per virtual device transmit descriptors
in Kbuild for lithium.

Change-Id: I2824de2daa5bce7b0ab6993fb7f85ea01ac0849d
CRs-Fixed: 1089685

Kbuild

@@ -1645,6 +1645,7 @@ CDEFINES += -DQCA_WIFI_QCA8074
 CDEFINES += -DQCA_WIFI_NAPIER_EMULATION
 CDEFINES += -DQCA_WIFI_QCA8074_VP
 CDEFINES += -DDP_INTR_POLL_BASED
+CDEFINES += -DTX_PER_VDEV_DESC_POOL
 endif
 
 # Dummy flag for WIN/MCL converged data path compilation