usb: gadget: Gadget directory cleanup - group legacy gadgets

The drivers/usb/gadget directory contains many files.
Files which are related can be distributed into separate directories.
This patch moves the legacy gadgets (i.e. those not using configfs)
into a separate directory.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --cc drivers/usb/gadget/Kconfig
Simple merge

diff --cc drivers/usb/gadget/Makefile
Simple merge

diff --cc drivers/usb/gadget/legacy/Kconfig
Simple merge

diff --cc drivers/usb/gadget/legacy/Makefile
Simple merge

diff --cc drivers/usb/gadget/legacy/acm_ms.c
Simple merge

diff --cc drivers/usb/gadget/legacy/audio.c
Simple merge

diff --cc drivers/usb/gadget/legacy/cdc2.c
Simple merge

diff --cc drivers/usb/gadget/legacy/dbgp.c
Simple merge

diff --cc drivers/usb/gadget/legacy/ether.c
Simple merge

diff --cc drivers/usb/gadget/legacy/g_ffs.c
Simple merge

diff --cc drivers/usb/gadget/legacy/gmidi.c
Simple merge

diff --cc drivers/usb/gadget/legacy/hid.c
Simple merge

diff --cc drivers/usb/gadget/legacy/inode.c
Simple merge

diff --cc drivers/usb/gadget/legacy/mass_storage.c
Simple merge

diff --cc drivers/usb/gadget/legacy/multi.c
Simple merge

diff --cc drivers/usb/gadget/legacy/ncm.c
Simple merge

diff --cc drivers/usb/gadget/legacy/nokia.c
Simple merge

diff --cc drivers/usb/gadget/legacy/printer.c
Simple merge

diff --cc drivers/usb/gadget/legacy/serial.c
Simple merge

diff --cc drivers/usb/gadget/legacy/tcm_usb_gadget.c
Simple merge

diff --cc drivers/usb/gadget/legacy/tcm_usb_gadget.h
Simple merge

diff --cc drivers/usb/gadget/legacy/webcam.c
Simple merge

diff --cc drivers/usb/gadget/legacy/zero.c
Simple merge