staging: wilc1000: move multiple definition of same macro to common header

Move the same #define from multiple '.c' files to common header file.
Instead of having same macro in different '.c' files, now kept in
common '.h' file.

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