Removing redundant proximity events
PROXIMITY_BASE_DATA_SET and PROXIMITY_EVENT_CHANGE_STATE were the same
PROXIMITY_BASE_DATA_SET has been removed.
PROXIMITY_BASE_DATA_SET was used for polling events and PROXIMITY_EVENT_CHANGE_STATE was used for event driven
Since both these represent the same proximity event, DATA_SET type has been removed.
And PROXIMITY_EVENT_CHANGE_STATE has been renamed to PROXIMITY_CHANGE_STATE_EVENT to make it simpler.
The change has been tested on rd-pq device for all sensord API and all API were found to be working.
Change-Id: Idb5a5213fdeecdeef0503b8f7388cdb2b0b36385