fst: support eng hotword

雾聪

2023-12-12 3c83d64c84602de055f503af7d4e2761c829ec2e

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peme    p.m.
pe eme    p.m.
p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
ame    a.m.
a eme    a.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.