OBEX: Support BTOBEX lib.

Add javax.btobex lib to support Obex Over L2CAP
features in further steps.

Add base files from AOSP OBEX lib to btobex folder
at frameworks/base/btobex project for now.

CRs-Fixed: 639499
Change-Id: I983830bce32fbd1446500b9656978e090ca9f259
OBEX: OBEX L2CAP feature and bug fix(es).

Squashed commit of the following:

commit 39b512ae6f81de0e972eef1d47e7340e6b7b1e50
Author: Ashwini Munigala <AshwiniM@codeaurora.org>
Date: Wed Jun 18 12:45:09 2014 +0530

    OBEX: Update default OBEX version parameter to 1.0.

    Update default OBEX protocol version to 1.0 for
    OBEX CONNECT Request parameter.

    Change-Id: If38dccc8e9bab1761b9d1e96b18f5dd27dff60b7
    CRs-fixed: 680975

commit 0c17893a272252aa0314494db5a323494ac6dc61
Author: Ashwini Munigala <AshwiniM@codeaurora.org>
Date:   Tue Mar 25 19:04:34 2014 +0530

    OBEX: Support OBEX L2CAP features.

    OBEX Over L2CAP features from javax.btobex.
    Includes SRM and SRMP features support.

    Includes existing issue fixes from javax.obex lib.

    CRs-Fixed: 639499
    Change-Id: I70c2a4bfa3bc66532af56dfdb6e1f762aed8e71e

Change-Id: I673082f036c9abe47536c4723fc96b86ec8ad7df