Move libartpalette-system to system/libartpalette

Bug: 142944508
Test: art/tools/buildbot-build.sh --host && art/test/test.py --host -r -g
Test: art/tools/buildbot-build.sh --target && art/test/test.py --target -r -g
Change-Id: Ia04ce022fa91d2ac6c9b5046e301a9a6ba10a852
3 files changed