staging: wilc1000: remove unused log message using the RX_DBG tag

This patch remove unused log message using the RX_DBG tag

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>