MTP: Use media provider database to implement MTP device support.

Uses a new "MTP objects" table in the media provider to support basic
enumeration of the external storage file system.
Support for accessing audio, video and image metadata in the existing
media provider tables will be added in a later commit.

The C++ MtpDatabase class is now abstract, to support a proxy subclass that
calls through JNI to the Java MtpDatabase class in the media provider.

Change-Id: I90f0db5f3acc5d35ae78c27a8507edff16d14305
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/media/mtp/MtpDataPacket.h b/media/mtp/MtpDataPacket.h
index 146ef64..759c0f9 100644
--- a/media/mtp/MtpDataPacket.h
+++ b/media/mtp/MtpDataPacket.h
@@ -79,6 +79,7 @@
     void                putAUInt64(const uint64_t* values, int count);
     void                putString(const MtpStringBuffer& string);
     void                putString(const char* string);
+    void                putString(const uint16_t* string);
     inline void         putEmptyString() { putUInt16(0); }
     inline void         putEmptyArray() { putUInt32(0); }