staging: wilc1000: added Microchip copyright notice header

Cleanup the copyright notice header from the WILC1000 files.
Replace copyright header of 'Atmel' & 'NewportMedia' with 'Microchip & its
subsidiaries'. Also added the same copyright notice header for all
wilc1000 driver source and header files.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>