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

Add pre-built attribute to host module definition for fake snapshot. am: 9e5cc8a6 am: d7e3a124 am: 226b5f45 am: aafaf3ad

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



Change-Id: Ib2a5a49bcd820e3ba622f1152ed2102eb743ed06
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>