Add pre-built attribute to host module definition for fake snapshot. am: 9e5cc8a6 am: d7e3a124

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2044967



Change-Id: Iaa4355b0d76329c47b6370f855a8cbd0650a1d47
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>