Fix atrace async_dump miss come content issue

When using atrace async_start and async_stop/async_dump to dump trace,
atrace can't dump all content in /sys/kernel/debug/tracing/trace if
the size of content is big.

Change-Id: I433a309bc26ce9053b83a3abdac3822108ca584d
CRs-Fixed: 1106423
1 file changed