drivers/staging: make emxx_udc.c explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/staging/emxx_udc/Kconfig:config USB_EMXX
drivers/staging/emxx_udc/Kconfig:       bool "EMXX USB Function Device Controller"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

Since module_platform_driver() uses the same init level priority as
builtin_platform_driver() the init ordering remains unchanged with
this commit.

The .remove function was declared __exit, so it wouldn't have been
available for a sysfs bind/unbind anyway, so lets be explicit here and
use ".suppress_bind_attrs = true" to prevent root from doing something
silly.

We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.

Cc: Vincenzo Scotti <vinc94@gmail.com>
Cc: Haneen Mohammed <hamohammed.sa@gmail.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Roberta Dobrescu <roberta.dobrescu@gmail.com>
Cc: Tapasweni Pathak <tapaswenipathak@gmail.com>
Cc: Peter Chen <peter.chen@freescale.com>
Cc: Robert Baldyga <r.baldyga@samsung.com>
Cc: Chris Rorvick <chris@rorvick.com>
Cc: "Gujulan Elango, Hari Prasath (H.)" <hgujulan@visteon.com>
Cc: devel@driverdev.osuosl.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>