qcacld-3.0: Kbuild: usb: Add pld_usb_cnss flag

Add cppflag for enabling PLD_USB_CNSS

Change-Id: Ibd10c8e7029746d611dfae9642d3b8112aeac42f
CRs-Fixed: 2349229

Kbuild

@@ -1903,6 +1903,7 @@ cppflags-$(CONFIG_PLD_SDIO_CNSS_FLAG) += -DCONFIG_PLD_SDIO_CNSS
 cppflags-$(CONFIG_PLD_PCIE_CNSS_FLAG) += -DCONFIG_PLD_PCIE_CNSS
 cppflags-$(CONFIG_PLD_PCIE_INIT_FLAG) += -DCONFIG_PLD_PCIE_INIT
 cppflags-$(CONFIG_WLAN_FEATURE_DP_RX_THREADS) += -DFEATURE_WLAN_DP_RX_THREADS
+cppflags-$(CONFIG_PLD_USB_CNSS) += -DCONFIG_PLD_USB_CNSS
 
 #Enable NL80211 test mode
 cppflags-$(CONFIG_NL80211_TESTMODE) += -DWLAN_NL80211_TESTMODE