releasetools: Update the fingerprint when signing.

ro.bootimage.build.fingerprint should be updated when signing.

Bug: 22720426
Bug: 24009888
Change-Id: Ib246a257581fd31f90ad6b3d21f39d1a2de24ba8
(cherry picked from commit 265d9aeb622c5829787b16b903f028cacaa99c18)
1 file changed