Only update the display when brightness and state are valid.
If either are invalid then we're in an indeterminant state and need to wait until that's resolved. This should only happens at boot and then is immediately corrected when we set our initial desired state. By not checking the validity of the to-be-applied state, we're actually turning the display to our assumed state briefly (i.e. OFF) even though we don't know what state we actually want yet. Fixes: 196566901 Fixes: 196274559 Fixes: 195071558 Test: Reboot device, no flicker in boot animation Change-Id: Ie5a4c186e3af31eb8810f5c7014a4e2cc7cdbf91 (cherry picked from commit a00cda67)
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