fix parse boot_id error am: 1dca50c4e6 am: aaf980a5d2

Original change: https://android-review.googlesource.com/c/platform/test/vts-testcase/kernel/+/1554102

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I98ecf4ad058472f41ac8b0be0ec0640a3d80885c