Merge "Make PRODUCT_CHARACTERISTICS a single-valued variable"

# used for adding properties to build.prop of product partition

_product_list_vars += PRODUCT_PRODUCT_SERVICES_PROPERTIES

_product_list_vars += PRODUCT_ODM_PROPERTIES

_product_list_vars += PRODUCT_CHARACTERISTICS

# The characteristics of the product, which among other things is passed to aapt

_product_single_value_vars += PRODUCT_CHARACTERISTICS

# A list of words like <source path>:<destination path>[:<owner>].

# The file at the source path should be copied to the destination path