Using prepend as part of a function name is a poor choice. Whilst we're
about to make the syntax explict, improve the names anyway making the
conversion easier and the intent clear that this isn't an override.
(From OE-Core rev: 9d002acae720b0a8e96a6734424a142b86880461)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>