Merge "Move the `androidboot.` literal into its own variable" am: a3d37ac9b2

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1624290

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I57838147703e2ddcd3bdd7a3e8dca0ce8d6aefd1