fixed build errors for aosp generic system image

Following files are missing in AOSP and not needed
- device/google/marlin/init.recovery.common.rc
- vendor/google/products/marlin/bootanimation-1440-256col.zip
- vendor/google/certs/devkeys/devkey

Bug: 37259658
Test: built systemimage and tested it work with other sailfish images
Change-Id: I95e180b6adbe8d08348794fd6b5f41e810999aea