support BiCifParaformer timestamp output without vad

北念

2023-03-03 af3fb57fa9f3e635c8e3f16804a19ada6d83f5b2

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.