Removed objenesis-updated as it is no longer needed

The recent upgrade of objenesis to 2.5 and the change to switch
mockito-updated-target to use objenesis-target means that this
code is no longer needed.

Bug: 32912773
Test: make checkbuild
Change-Id: I040c33b2a50fcdbb07e9a7cee27f05b0e7f1626e