Revert "pixel3_maineline: Add changes to get pixel3_mainline building a boot.img"

This reverts commit 85f6a8aecd3ba7609d28ace79f474a411092ebdd.

Reason for revert: Caused build-break for aosp-master (pixel3_mainline-userdebug build)

Change-Id: I653961de83baa953cfdde32e42d5706869764d9a
3 files changed