Move the primary boot image in chroot environment.

This change moves the primary boot image to
`/system/framework/art_boot_images` in the chroot environment because
some run-tests (specifially, those that uses
`-Xonly-use-system-oat-files` or `--zygote` expects the primary boot
image to be in a trusted location.

Bug: 216467764
Test: art/test/testrunner/testrunner.py --target --64
Test: art/tools/run-gtests.sh -- -j4
Test: atest ArtGtestsTargetChroot
Change-Id: Ib0e9e15013a02639da2d904c97a69aea743709db
3 files changed