Add support for text/vCard and text/vCalendar MIME type

A vcf file can alias to both "text/vCard" and "text/x-vCard" MIME
types and an ics file can alias to "text/vCalendar" as well as
"text/x-vCalendar". However, if LineageOS does not get the "x-"
MIME type, it will incorrectly display an empty MMS.

Change-Id: I0b63767092c0e7422ff3592983d94b903d9e8cc5

src/com/android/messaging/mmslib/pdu/PduPersister.java

@@ -801,7 +801,7 @@ public class PduPersister {
                 // reliable.
                 final String encodedDataString = new EncodedStringValue(charset, data).getString();
                 if (encodedDataString != null && encodedDataString.startsWith(BEGIN_VCARD)) {
-                    contentType = ContentType.TEXT_VCARD;
+                    contentType = ContentType.TEXT_X_VCARD;
                     part.setContentType(contentType.getBytes());
                     if (LogUtil.isLoggable(TAG, LogUtil.DEBUG)) {
                         LogUtil.d(TAG, "PduPersister.persistPart part: " + uri + " contentType: " +