AHAL: add stream mutex to synchronize access to pal stream handle
pal_stream_handle can be released during standby, but at the same time may still be referenced in other pal_stream_xxx APIs, then it can cause null pointer deference issue. Add mutex to synchronize pal_stream_xxx APIs. Change-Id: Icabf2f7d438dabb0c0e56b61031833ab61a54742
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