mpc83xx: Make distinct MPC8349EMDS_SDRAM board

The MPC8349EMDS config file contains config options to enable SDRAM
support. To keep this ability after the Kconfig migration, create a new
MPC8349EMDS_SDRAM board that enables the SDRAM support and remove the
SDRAM support from the original board.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
6 files changed