aidl_integration_tests: use general-tests

Thid didn't work w/ general-tests before because tradefed was running
32-bit tests from test_suites_x86_64 on 32-bit devices, which caused
this test to fail, since it still installed 64-bit tests in that case,
and this test tried to run it. Although a separate bug is filed to
investigate that, switching the method of abi detection here.

Bug: 168807095
Test: `atest aidl_integration_tests` on 32-bit and mixed-bitness devices
Change-Id: I7da1cc3c11424f0eccc813545ef4f2cb439b25fc
2 files changed