Convert `aapt2_run_host_unit_tests` to Android.bp

The handling of `declare-1p-target` will be deferred for future
processing.

Bug: 322285259
Test: m aapt2_results
Test: m aapt2_run_host_unit_tests
Test: m -j out/host/linux-x86/gen/META/lic_intermediates/./out/soong/.intermediates/frameworks/base/tools/aapt2/aapt2_results.meta_lic
Change-Id: I65ff18c9f4b490726011a490ba9045bf2078068e