try to fix global timestamp mapping issue when HW timestamp is rollback to 0 #12451
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HW timestamp is 32bit.
when the HW timestamp is rollbacked to 0 from 2^32, the global timestamp may drift a little in about 1 second.
the value of _base_sample._x is copied from the HW timestamp.
the value of _base_sample._y is host timestamp.
when the HW timestamp is rollback, _x should be changed.