Ahat: Use art -d in tests

Use the debug dependencies and art -d for heap-dump generation.
The heap dump already depends on the core images, which are
generated with dex2oatd. This cuts down on the required
targets when building ahat-tests.

Bug: 72549306
Test: m ahat-tests
Test: m test-art-host
Change-Id: I76d99b41d4d31b99a68f6085940ac0885c756905