gta4xl-common: deduplicate WIFI_DRIVER_FW_PATH_PARAM BoardConfig flag

Change-Id: I2706892f801b9608e109af6ae1c21ca326b7d863
diff --git a/BoardConfigPlatform.mk b/BoardConfigPlatform.mk
index 695a89b..41b9749 100644
--- a/BoardConfigPlatform.mk
+++ b/BoardConfigPlatform.mk
@@ -220,10 +220,6 @@
 # external/wpa_supplicant_8/Android.mk
 WPA_SUPPLICANT_VERSION           := VER_0_8_X
 
-# frameworks/opt/net/wifi/libwifi_hal/Android.mk
-# hardware/samsung/wifiloader/Android.mk
-WIFI_DRIVER_FW_PATH_PARAM        := "/sys/module/bcmdhd/parameters/firmware_path"
-
 ### RIL
 # Use stock RIL stack
 ENABLE_VENDOR_RIL_SERVICE := true