Merge "init: Look for partition only on a boot device if using boot_part_uuid" into main am: c43fd51571

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3336854

Change-Id: Ifea13a041e88cdf333b3bd95b2449fb21e961d37
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>