net: tsec: Remove non-DM_ETH support code

As DM_ETH is required for all network drivers, it's now safe to remove
the non-DM_ETH support code.  Doing this removes some board support code
which was also unused. Finally, this removes some CONFIG symbols that
otherwise needed to be migrated to Kconfig, but were unused in code now.

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