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
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 1b46ff9..943d267 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -147,6 +147,8 @@
                 <data android:mimeType="video/*" />
                 <data android:mimeType="audio/*" />
                 <data android:mimeType="text/x-vcard" />
+                <data android:mimeType="text/x-vcalendar" />
+                <data android:mimeType="text/calendar" />
                 <data android:mimeType="text/plain" />
                 <data android:mimeType="text/html" />
                 <data android:mimeType="text/xml" />