fix parse boot_id error am: 1dca50c4e6 am: aaf980a5d2 am: bbe397796b am: 9e4a30a4b7

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ifaa8fff44868762adaf8d506e99e28599218831d