[tts] normalize wav max value to 1 in preprocess, test=tts #1887
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PR types
Performance optimization
PR changes
APIs
Describe
一些波形文件的最大值超过了1，在做preprocess的时候会跳过，对于后面finetune vocoder中link_wav也会有一定影响。如果把他们的最大值映射为1，做一个归一化处理，那么就可以保留这些音频了。