add unpackbootimg to otatools

Change-Id: I4e294c05eacc8bef8273247bcf1bf382291a3d31

Author: koush

core/Makefile

@@ -1352,6 +1352,7 @@ DISTTOOLS :=  $(HOST_OUT_EXECUTABLES)/minigzip \
 	  $(HOST_OUT_EXECUTABLES)/adb \
 	  $(HOST_OUT_EXECUTABLES)/mkbootfs \
 	  $(HOST_OUT_EXECUTABLES)/mkbootimg \
+	  $(HOST_OUT_EXECUTABLES)/unpackbootimg \
 	  $(HOST_OUT_EXECUTABLES)/fs_config \
 	  $(HOST_OUT_EXECUTABLES)/mkyaffs2image \
 	  $(HOST_OUT_EXECUTABLES)/zipalign \