hammerhead: Update blobs to L preview release

Change-Id: Ic18d912a9b222dd55612e84d3785a636c2ca4a1f
hammerhead: update files from factory 5.0 image

Change-Id: I25a1f726974722b34b94f8c3d8f3639b14e53319
hammerhead: Add APKs as PRODUCT_PACKAGES

This allows for re-signing with release keys

Change-Id: I650f4d1fbb00a7f563ee6820b6fda932dcaf014f