Merge "Revert "Make foreground and background I/O priority different"" into main am: 0b2f24ceb1

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3126515

Change-Id: I1dd7a5eb5c8d3d31267f82b98eefda8ab32eac48
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>