Clarifying LOW_POWER_MODE_TRIGGER_LEVEL comment.

The comment made it sound like 0 isn't used to turn it off in Q anymore,
however, 0 is still used to turn it off.

Bug: N/A
Test: N/A
Change-Id: I17262bd7087de9ae8cbbcd7433fcbccfbc6b66b2
1 file changed