Use default handling of board-info.txt

No need to force the use of device/asus/grouper/board-info.txt,
that's the default value, and forcing it here overrides the value
that might have been set in BoardConfigVendor.mk

Change-Id: Iedc7fde7c683653c144ba69ab31e5387016a86bd
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 174e189..98ffda4 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -67,7 +67,6 @@
 WIFI_DRIVER_FW_PATH_P2P     := "/vendor/firmware/fw_bcmdhd_p2p.bin"
 
 TARGET_BOOTLOADER_BOARD_NAME := grouper
-TARGET_BOARD_INFO_FILE := device/asus/grouper/board-info.txt
 
 BOARD_USES_GENERIC_AUDIO := false
 BOARD_USES_ALSA_AUDIO := false