Revert "simpleperf: change default aux buffer size to 1M."

This reverts commit 847ed0bb3d9f1cc6db98b56774d4214b60e3c712.

Reason for revert: no longer needed after using scatter-gather mode in ETR.
Bug: 213522686

Change-Id: I5113c77dd08f987432610ee33a94d29a3d03f2ec
1 file changed