split board-info.txt into AOSP and non-AOSP versions

Change-Id: I1e10667fe10404c2a52db6c23844ee0fa7db0718
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 38c1de5..b6f829f 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -87,3 +87,7 @@
 # Avoid the generation of ldrcc instructions
 NEED_WORKAROUND_CORTEX_A9_745320 := true
 BOARD_KERNEL_CMDLINE := androidboot.carrier=wifi-only product_type=w
+
+# Use the open-source board-info file if none was set by the vendor
+# config.
+TARGET_BOARD_INFO_FILE ?= device/moto/wingray/board-info.txt