OPP: Fix support for vCal 1.0 and iCal 2.0

* Add corresponding MIME types in AndroidManifests
        text/x-vcalendar
        text/calendar
* Add corresponding support flags in SDP record
* Remove one time use constants and add comments to SDP
  record array
* Remove text/x-vcalendar from black list
* Removed some dead code

Bug: 63259707
Test: make, PTS test IOPT/SDAS/BV-03-I, send/receive .ics
      and .vcs files over Bluetooth
Change-Id: I06d67da09050a7f5e244568e57c9685bfdf6cdd6