Add BSD license to NVIC_SetVector and NVIC_GetVector.

When the SDK was released it seems like theses files (cmsis_nvic.c and cmsis_nvic.h) were missed getting tagged with a proper license and have been copied/pasted/edited quite a lot since then.
Err. Copy paste error. Will patch tonight.

On Monday, October 13, 2014, Bogdan Marinescu <notifications@github.com>
wrote:

> In libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC11UXX/cmsis_nvic.c:
>
> >   *
> > - * CMSIS-style functionality to support dynamic vectors
> > - */
> > -
> > + * Redistribution and use in source and binary forms, with or without
> > + * modification, are permitted provided that the following conditions are met:
> > + *
> > + * 1. Redistributions of source code must retain the above copyright notice,
> > + *    this list of conditions and the following disclaimer.
> > + * 2. Redistributions in binary form must reproduce the above copyright notice,
> > + *    this list of conditions and the following disclaimer in the documentation
> > + *    and/or other materials provided with the distribution.
> > + * 3. Neither the name of STMicroelectronics nor the names of its contributors
>
> Why do we mention STMicroelectronics here ?!
>
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