ANDROID: usb: gadget: configfs: add MTP function

This MTP function is based on years of work originally done in the
Android kernel tree by:
    Mike Lockwood <lockwood@android.com>
    Benoit Goby <benoit@android.com>
    Colin Cross <ccross@android.com>
    Arve Hjønnevåg <arve@android.com>
    Peter Oh <poh@broadcom.com>
    Greg Hackmann <ghackmann@google.com>
    Badhri Jagan Sridharan <Badhri@google.com>
I've folded the series up to make it easier to review, and to provide
a coherent patch description.

Post Gingerbread (Android v2.3), Android dropped USB Mass Storage
in favor of Media Transfer Protocal (MTP), which is widely used for
transferring media files to digital music players and similar
applications. This USB gadget function implements MTP functionalty.

Historically this function has been a part of Android composite
gadget driver. Android composite driver was Android's solution
for dynamic gadget function switching prior to the ConfigFS gadget
being merged. There were failed few attempts in past
http://marc.info/?l=linux-usb&m=132451695808552 to upstream Android
composite driver as well. Now this Android MTP gadget function has been
re-implemented so as to be used as a generic ConfigFS function instead.

Again, many thanks to Mike, Benoit, Colin, Arve, Peter, Greg and Badhri,
as they are the real authors of this work. However, I've folded their
patches together and modified it enough that I don't want them to be
blamed for any mistakes I've made condensing their patches down.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>

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