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/configs/ls1021aqds_nor_lpuart_defconfig b/configs/ls1021aqds_nor_lpuart_defconfig
index 4d910cd..dd44140 100644
--- a/configs/ls1021aqds_nor_lpuart_defconfig
+++ b/configs/ls1021aqds_nor_lpuart_defconfig
@@ -1,6 +1,5 @@
 CONFIG_ARM=y
 CONFIG_TARGET_LS1021AQDS=y
-CONFIG_SYS_FSL_DDR3=y
 CONFIG_VIDEO=y
 CONFIG_DEFAULT_DEVICE_TREE="ls1021a-qds-lpuart"
 CONFIG_FIT=y
@@ -28,6 +27,7 @@
 CONFIG_CMD_FAT=y
 CONFIG_OF_CONTROL=y
 CONFIG_DM=y
+CONFIG_SYS_FSL_DDR3=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y
 CONFIG_PCI=y