mkbootimg: Include system/tools/dtbtool

* Moved from device/qcom/common

Change-Id: I9b301923aaebdbfbc8599e0f8524b2a38fe6cefa
diff --git a/mkbootimg.mk b/mkbootimg.mk
index 0daa173..afa2182 100644
--- a/mkbootimg.mk
+++ b/mkbootimg.mk
@@ -17,7 +17,7 @@
 ifeq ($(strip $(BOARD_KERNEL_SEPARATED_DT)),true)
 ifneq ($(strip $(BOARD_KERNEL_PREBUILT_DT)),true)
 ifeq ($(strip $(BUILD_TINY_ANDROID)),true)
-include device/qcom/common/dtbtool/Android.mk
+include system/tools/dtbtool/Android.mk
 endif
 
 ifeq ($(strip $(TARGET_CUSTOM_DTBTOOL)),)