fsl_ddr: Move DDR config options to driver Kconfig

Create driver/ddr/fsl/Kconfig and move existing options. Clean up
existing macros.

Signed-off-by: York Sun <york.sun@nxp.com>
[trini: Migrate sbc8641d, xpedite537x and MPC8536DS, run a moveconfig.py -s]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/cpu/mpc86xx/Kconfig b/arch/powerpc/cpu/mpc86xx/Kconfig
index 11afffa..ff21c48 100644
--- a/arch/powerpc/cpu/mpc86xx/Kconfig
+++ b/arch/powerpc/cpu/mpc86xx/Kconfig
@@ -29,10 +29,14 @@
 config ARCH_MPC8610
 	bool
 	select FSL_LAW
+	select SYS_FSL_HAS_DDR1
+	select SYS_FSL_HAS_DDR2
 
 config ARCH_MPC8641
 	bool
 	select FSL_LAW
+	select SYS_FSL_HAS_DDR1
+	select SYS_FSL_HAS_DDR2
 
 config FSL_LAW
 	bool