usb: gadget: f_mtp: Add snapshot of USB MTP function driver

This change adds MTP and PTP function driver support. This
snapshot is taken as of msm-4.14 commit 08f8156b8e2810
("ARM: dts: msm: update bwmon irq in trinket target").

Change-Id: I3cb0792679c3ce901ba8b565b1e21ac67f508eae
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>