ppc: Remove MPC837XEMDS board

This board has not been converted to CONFIG_DM_MMC by the deadline.
Remove it.  As this is the last ARCH_MPC837X platform, remove that
support as well.

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