Revert "ANDROID: dm-bow: Protect Ranges fetched and erased from the RB tree"

This reverts commit 5b194414.

Reason for revert: Needs rework - causes unforeseen deadlock.

Bug: 227141277
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Idc442f6504de071eaf81a05f72b6db94dc16e333