staging: wilc1000: Replace printk() with pr_info().

Fix checkpatch warning:

WARNING: Prefer [subsystem eg: netdev]_info([subsystem]dev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...

Replace printk(KERN_INFO...) by pr_info() for more uniform error reporting.

Signed-off-by: Elise Lennion <elise.lennion@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>