Refactor the Bluetooth timers

Refactor the Bluetooth timers

* Updated the alarm API:
  - Existing API alarm_new() is modified to take an alarm name
    as an argument.
  - New API alarm_new_periodic() is used to create a periodic
    alarm.
  - Added new API alarm_is_scheduled() to test whether an alarm is
    scheduled.
  - Existing API alarm_set_periodic() is removed: a periodic
    alarm is created by alarm_new_periodic().
  - Added new API alarm_set_on_queue() to set an alarm whose
    callback is executed on a specific queue.
  - Added new API alarm_register_processing_queue() and
    alarm_unregister_processing_queue() to register/unregister
    a queue and the corresponding thread for alarm processing.
  - Added corresponding unit tests.

* Updated the alarm internals:
  - Added alarm_info_t for collecting alarm-related information
    and statistics.
  - Collect and store alarm-related statistics into alarm_info_t
    per alarm.
  - Include the alarm-related statistics and info into the native
    dumpsys output for Bluetooth.
  - Once an alarm expires, the alarm execution is scheduled for
    processing on another internal alarm-specific thread, not
    on the thread that is maintaining the alarms.
  - Implemented callback execution ordering guarantee among
    timers on the same thread with exactly same timeout values.

* Refactor some of the usage of alarm_set() and simplify the
  code by using alarm_set_on_queue() instead.

* Removed the non_repeating timers wrapper, and use directly
  the alarm mechanism / API.

* Refactored all timer_entry_t timers and replaced them with alarm_t
  timers:
  - Replaced the btu_start_timer() / btu_stop_timer() /
    btu_start_quick_timer() / btu_stop_quick_timer() /
    btu_oneshot_alarm() mechanism with alarm_set_on_queue() and
    alarm_cancel()
  - Removed the whole mechanism around the BTU_TTYPE_* timers.

* Fixed a bug when processing the GATT indication confirmation timer
  expiration (timer tGATT_TCB.conf_timer: b/26610829).

* Renamed and/or split misc. timeout functions, fields, and timers

* Renamed time-related constants and changed the values from seconds
  to milliseconds

* Replaced timer tAVDT_CCB.timer_entry with three mutually exclusive timers:
  idle_ccb_timer, ret_ccb_timer, rsp_ccb_timer
  The reason we are using three timers, is because in the original code
  function avdt_ccb_chk_timer() used the timer type in its logic: it
  would stop the timer only if the type is "idle".

* Removed btm_ble_timeout() and replaced it with multiple timeout
  callback functions (per timer)

* Fix the actual value of the global constant BT_1SEC_TIMEOUT and
  rename it to BT_1SEC_TIMEOUT_MS

* Removed btu_cb and associated timers and events, because they are
  never used.

* Removed unused timers, functions, struct and declarations that are
  not used / needed.

Bug: 26611369
Bug: 26610829

Change-Id: I812c8c31710a5daefc58b01fcf35c353768f390f