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Trace mailbox shows garbage #81

Description

@keqiaozhang

There're full of garbage in mailbox after system booted. this issue happens with kernel sof-v4.18 and sof-dev branch on APL and CNL, but cannot reproduce this issue on BYT.
Error log:
using 19.20MHz timestamp clock
0x0 [960767920505.705811] delta [********] value 0xffffffffffffffff
0x10 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
0x20 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
0x30 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
0x40 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
0x50 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
0x60 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
0x70 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
0x80 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
0x90 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
0xa0 [960767920505.705811] delta [0.000000] value 0xffffffffffffffff
rmbox.log

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