[PATCH] pcnet32: break in 2.6.18-rc1 identified

A change I made for 2.6.17 and another for 2.6.18 do not work on older
pcnet32 chips which I do not have access to.  If the chip is a 79C970 or
79C965, do not try and suspend or check the link status.
I have tested with a 79C970A, 79C971, 79C972, 79C973, 79C975, 79C976,
and 79C978.

Signed-off-by: Don Fry <brazilnut@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>