The PHY driver was too verbose and corrupted the boot message display
like this:

...
Net:   Ethernet PHY: KSZ8873 @ 0x02
DaVinci-EMAC
...

Turn printf() into debug() so we get the expected output again:

...
Net:   DaVinci-EMAC
...

Signed-off-by: Heiko Schocher <hs@denx.de>
cc: Paulraj Sandeep <s-paulraj@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>