staging: wilc1000: added 'WILC_' prefix in header guard macro

Use 'WILC_' prefix in header guard to follow the proper naming
convention for macro name.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Link: https://lore.kernel.org/r/20191105095058.24223-4-ajay.kathat@microchip.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>