The current code retrieves the firmware package version from firmware
everytime ethtool -i is run. There is no reason to do that as the
firmware will not change while the driver is loaded. Get the version
once at init time.
Also, display the full 4-part firmware version string and remove the
less useful interface spec version.
Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>