Add phony target for genrule am: 65f412d082 am: 14440b5dfa am: e0ff174661 am: 31d77b80a2

Original change: https://android-review.googlesource.com/c/platform/system/tools/aidl/+/1688284

Change-Id: I13f2eb58ed6e9f6ab9c2b451692121939b177363