recipeutils: bbappend_recipe: remove old srcuri entry if parameters are different

recipeutils: bbappend_recipe: remove old srcuri entry if parameters are different

Currently we do not add a new src_ury entry if the entry already exists
AND the parameters are the same.

I believe that when an entry already exist with different parameters,
we should remove it and add the new entry otherwise we end up with two
entries with different parameters

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>