fix LfrCmvn for paraformer (#1097)

Yabin Li

2023-11-16 0c68c942fe84567c48f62b59a0bc0e60d0b29b15

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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.