net: ethernet: davinci_emac: Fix printing of base address

Use %pa which is the correct formatter to print a physical address,
instead of %p which is just a pointer.

Fixes: a6286ee6

 ("net: Add TI DaVinci EMAC driver")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>