Revert "net: smc911x: Automatically Update ethaddr with MAC"

Upon further discussion on the mailing list, we should not get in the
situation where the generic code path to set ethaddr/etc correctly does
not work.  Revert this until someone can further debug the smc911x
driver regarding this issue.

This reverts commit 387cbf09.

Signed-off-by: Tom Rini <trini@konsulko.com>