[PATCH] bcm43xx: do not rebuild when kernel version changes

In bcm43xx_ethtool, UTS_RELEASE is used. Replacing this with utsname()->release
avoids rebuilding this module each time the kernel version changes.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>