staging: wilc1000: rename wlan init and deinit function prefixed with wil1000

Rename wilc1000_wlan_init() & wilc1000_wlan_deinit() function to avoid
unecessary 'wilc1000' prefix in function to be inline with other
function naming convension.

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