package/petitboot: bump to version 1.15
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 5652306f7e72792655f0b2b2ea978734fc2e5938)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>