Fix duplicate copy file rules

If these libraries are built, both BUILD_COPY_FILES and
BUILD_SHARED_LIBRARY would copy the headers. This would create a warning
because multiple rules would define the same target header file.

Bug: 27302058
Change-Id: If91bd70d2320aaaee9679642ff9ea48b99739cbd
(cherry picked from commit b360857e924f57588e29e47b047519ce097beed6)

libcopybit/Android.mk

@@ -14,13 +14,13 @@
 
 LOCAL_PATH:= $(call my-dir)
 include $(LOCAL_PATH)/../common.mk
-include $(CLEAR_VARS)
 
+include $(CLEAR_VARS)
 LOCAL_COPY_HEADERS_TO         := $(common_header_export_path)
 LOCAL_COPY_HEADERS            := copybit.h copybit_priv.h c2d2.h
-#Copy the headers regardless of whether copybit is built
 include $(BUILD_COPY_HEADERS)
 
+include $(CLEAR_VARS)
 LOCAL_MODULE                  := copybit.$(TARGET_BOARD_PLATFORM)
 LOCAL_VENDOR_MODULE           := true
 LOCAL_MODULE_RELATIVE_PATH    := hw