staging: wilc1000: remove unnecessary log message using GENERIC_DBG tag

This patch remove unnecessary log message using GENERIC_DBG tag.
Needed log messages has changed netdev_dbg from PRINT_D.
And removes variables that were used to log message.

Signed-off-by: Chris Park <chris.park@atmel.com>
Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>