staging: wilc1000: changes 'val' type to u8 in wilc_cfg_byte struct

Use the correct datatype for storing the byte value in 'wilc_cfg_byte'
struct.

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