staging: wilc1000: change compatible string from atmel to microchip

Use 'microchip' in compatible string instead of 'atmel', also replace '_'
with '-' before the module. Remove 'wilc1000' prefix from device table
name.

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