staging: wilc1000: added 'wilc_' prefix for function in wilc_sdio.c file

Cleanup patch to have proper follow clear namespace in wilc_sdio.c file.

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