Allow to tag owner to PRODUCT_COPY_FILES

PRODUCT_COPY_FILES now is a list of words like <source
path>:<destination path>[:<owner>].
The optional :<owner> is used to indicate the owner of a vendor file.

Bug: 7048854
Change-Id: I435d1e18b7a091fb62513062cfc2e420e51557ec
diff --git a/core/product_config.mk b/core/product_config.mk
index 9c85d2c..7bb1852 100644
--- a/core/product_config.mk
+++ b/core/product_config.mk
@@ -284,11 +284,12 @@
 endif
 endif
 
-# A list of words like <source path>:<destination path>.  The file at
-# the source path should be copied to the destination path when building
-# this product.  <destination path> is relative to $(PRODUCT_OUT), so
-# it should look like, e.g., "system/etc/file.xml".  The rules
-# for these copy steps are defined in config/Makefile.
+# A list of words like <source path>:<destination path>[:<owner>].
+# The file at the source path should be copied to the destination path
+# when building  this product.  <destination path> is relative to
+# $(PRODUCT_OUT), so it should look like, e.g., "system/etc/file.xml".
+# The rules for these copy steps are defined in build/core/Makefile.
+# The optional :<owner> is used to indicate the owner of a vendor file.
 PRODUCT_COPY_FILES := \
     $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_COPY_FILES))