qcacld-3.0: Add 11AX header flag in Kbuild

Add a new CONFIG_QCA6290_11AX flag to track & enable all 11ax related
header changes.

Change-Id: I265364eafb05c34eea18235a15c5e317716f6ecf
CRs-Fixed: 2124274

Kbuild

@@ -1450,8 +1450,13 @@ ifeq ($(CONFIG_PLD_USB_CNSS), y)
 PLD_OBJS +=	$(PLD_SRC_DIR)/pld_usb.o
 endif
 
+ifeq ($(CONFIG_QCA6290_11AX), y)
+TARGET_INC :=	-I$(WLAN_ROOT)/../fw-api/hw/qca6290/11ax/v1 \
+		-I$(WLAN_ROOT)/../fw-api/fw
+else
 TARGET_INC :=	-I$(WLAN_ROOT)/../fw-api/hw/qca6290/v2 \
 		-I$(WLAN_ROOT)/../fw-api/fw
+endif
 
 LINUX_INC :=	-Iinclude
 
@@ -2234,6 +2239,10 @@ CDEFINES += -DTSO_DEBUG_LOG_ENABLE
 CDEFINES += -DDP_LFR
 endif
 
+ifeq ($(CONFIG_QCA6290_11AX), y)
+CDEFINES += -DQCA_WIFI_QCA6290_11AX
+endif
+
 ifeq ($(CONFIG_WLAN_FEATURE_11AX),y)
 CDEFINES += -DWLAN_FEATURE_11AX
 CDEFINES += -DWLAN_FEATURE_11AX_BSS_COLOR