net: encx24j600: move rev announcement to probe function

When encx24j600 is open and closed many times due to userspace polling the
interface, the log gets noise with this log message.

Moving this to encx24j600_spi_probe function where it belongs.

Signed-off-by: Jon Ringle <jringle@gridpoint.com>
Signed-off-by: David S. Miller <davem@davemloft.net>