In the only implementation of 'mac read', it doesn't display the
contents of the eeprom as the help indicated unless compiled with
DEBUG. It only re-reads the contents of the EEPROM into memory.
Displaying the contents of the EEPROM is done by passing no
arguments to 'mac'.

Signed-off-by: Michael Jones <michael.jones@matrix-vision.de>
Acked-by: Detlev Zundel <dzu@denx.de>