KSZ8851-SNL: Add support for EEPROM MAC address

Add support for reading the MAC address from the system registers if there
is an EEPROM present. This involves caching the KS_CCR register for later
use (will also be useful for ETHTOOL support) and adding a print to say
that there is an EEPROM present.

Change-Id: Id23e88fbbb970daeb28ec0dceba4752eddd2d827
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
[sboyd@codeaurora.org: Remove our implementation]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>