add kernel module for reading dragonrise gamepads (generick usb joystick)

[valentecaio]

Hi!
This patch enables the kernel to read dragonrise joysticks attached to the usb of RG350, using an OTG cable.
I've tested it with the following device:

I: Bus=0003 Vendor=0079 Product=0006 Version=0110
N: Name="DragonRise Inc.   Generic   USB  Joystick  "
P: Phys=usb-jz4740-1.3/input0
S: Sysfs=/devices/platform/jz4770-ohci/usb1/1-1/1-1.3/1-1.3:1.0/input/input6
U: Uniq=
H: Handlers=js2 event5 
B: PROP=0
B: EV=20001b
B: KEY=fff 0 0 0 0 0 0 0 0 0
B: ABS=3002f
B: MSC=10
B: FF=1 7030000 0 0