uboot-imx

Fix MAC address setting in DM9000 driver.

The logic to check if there is a correct MAC address in the DM9000
EEPROM, added in the last patch, is wrong. Now the MAC address is
always taken from the environment, even if a suitable MAC is present
in the EEPROM.

Signed-off-by: Stefano Babic <sbabic@denx.de>