image.py: Fix error in graph sorting
The graph sorting algorithm for image dependencies does a look for an
occurrence of a searched string instead of comparing the chunk to the
searched string. This leads to the problem that ubifs is recognized as ubi aswell.
This fixes this by splitting up the string into chunks.
(From OE-Core rev:
cec9725c540c2d54c27092e40d159694cea75b5f)
Signed-off-by: Pascal Bach <pascal.bach@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
