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Required because the lights need to be turned off late in boot
(e.x. during fsck for disk health), and before, blank_screen
accessing light encountered a race condition where if it didn't
get scheduled before all of the processes which were getting
shutdown were getting killed, the screen wouldn't blank.
Bug: 74976325
Test: adjusting brightness continues to work
Test: screen blanks during shutdown at the correct time
including when an artificial 5s delay is inserted when
the phone normally fscks (which can also be quick)
Change-Id: I57ebc11d7ecf57ee327c681455712f4b53de6fd3
Merged-In: I57ebc11d7ecf57ee327c681455712f4b53de6fd3
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