Enable hwui_unit_tests in presubmit for libs/hwui am: ff0bf7b109

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2378868

Change-Id: I08f5e4ecdf818818fd47ae15b7a3b32324aefc7d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>