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>
diff --git a/arch/powerpc/cpu/mpc83xx/Kconfig b/arch/powerpc/cpu/mpc83xx/Kconfig
index 65f4583..0ce1aad 100644
--- a/arch/powerpc/cpu/mpc83xx/Kconfig
+++ b/arch/powerpc/cpu/mpc83xx/Kconfig
@@ -67,6 +67,14 @@
 	select SYS_FSL_DDR_BE
 	select SYS_FSL_HAS_DDR2
 
+config TARGET_MPC8349EMDS_SDRAM
+	bool "Support MPC8349EMDS_SDRAM"
+	select ARCH_MPC8349
+	select BOARD_EARLY_INIT_F
+	select SYS_FSL_DDR
+	select SYS_FSL_DDR_BE
+	select SYS_FSL_HAS_DDR2
+
 config TARGET_MPC8349ITX
 	bool "Support MPC8349ITX"
 	select ARCH_MPC8349