logd: do not attempt to sort log messages by time

Sorting does not work in all cases:
* It only sorts messages up to 5 seconds backwards in time
* CLOCK_REALTIME, which is used as the time that is sorted, can jump
  drastically
* Buffers are not sorted if there is a reader holding a region lock

Removing sorting entirely will give more consistent behavior from
logd.

Test: logcat still seems sane
Change-Id: I0923ab2fb377cda941c1e4972689df46f395ac99