remove the system board name from the build fingerprint

Change-Id: I4cbbd03084b6ac24184b7475be3d34130094667d
diff --git a/core/Makefile b/core/Makefile
index 0adc673..bdd1d7e 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -73,7 +73,7 @@
 
 # The string used to uniquely identify this build;  used by the OTA server.
 ifeq (,$(strip $(BUILD_FINGERPRINT)))
-  BUILD_FINGERPRINT := $(PRODUCT_BRAND)/$(TARGET_PRODUCT)/$(TARGET_DEVICE)/$(TARGET_BOOTLOADER_BOARD_NAME):$(PLATFORM_VERSION)/$(BUILD_ID)/$(BUILD_NUMBER):$(TARGET_BUILD_VARIANT)/$(BUILD_VERSION_TAGS)
+  BUILD_FINGERPRINT := $(PRODUCT_BRAND)/$(TARGET_PRODUCT)/$(TARGET_DEVICE):$(PLATFORM_VERSION)/$(BUILD_ID)/$(BUILD_NUMBER):$(TARGET_BUILD_VARIANT)/$(BUILD_VERSION_TAGS)
 endif
 ifneq ($(words $(BUILD_FINGERPRINT)),1)
   $(error BUILD_FINGERPRINT cannot contain spaces: "$(BUILD_FINGERPRINT)")