Merge "Add a new property trim_extension for gensrcs" into main am: 512b52f759

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3048196

Change-Id: I16072941341f26fcbad1b04df6f0ab34734cece2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>