ppc: Remove MPC8568MDS board

This board has not been converted to CONFIG_DM_PCI by the deadline and is
also missing conversion to CONFIG_DM.  Remove it.  As this is the last
ARCH_MPC8568 platform, remove that support as well.

Cc: Priyanka Jain <priyanka.jain@nxp.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
16 files changed