sis190: read the mac address from the eeprom first

upstream commit: 563e0ae0

Reading a serie of zero from the cmos sram area do not work
well with is_valid_ether_addr(). Let's read the mac address
from the eeprom first as it seems more reliable.

Fix for http://bugzilla.kernel.org/show_bug.cgi?id=9831



Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

dsd@gentoo.org notes:
This patch fixes http://bugs.gentoo.org/207706



Cc: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>