nxp: Migrate a number of DDR related symbols to Kconfig

- Guard most of the options in drivers/ddr/fsl/Kconfig with
  SYS_FSL_DDR || SYS_FSL_MMDC.
- Migrate FSL_DMA, DDR_ECC, DDR_ECC_CMD, and ECC_INIT_VIA_DDRCONTROLLER
  to Kconfig.
- Clean up the logic for including the DDR_ECC_CMD code.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1088ardb_sdcard_qspi_SECURE_BOOT_defconfig b/configs/ls1088ardb_sdcard_qspi_SECURE_BOOT_defconfig
index 0a21add..81b87be 100644
--- a/configs/ls1088ardb_sdcard_qspi_SECURE_BOOT_defconfig
+++ b/configs/ls1088ardb_sdcard_qspi_SECURE_BOOT_defconfig
@@ -59,6 +59,8 @@
 CONFIG_SPL_DM=y
 CONFIG_SCSI_AHCI=y
 # CONFIG_SPL_BLK is not set
+CONFIG_DDR_ECC=y
+CONFIG_ECC_INIT_VIA_DDRCONTROLLER=y
 CONFIG_SYS_I2C_LEGACY=y
 CONFIG_SYS_MXC_I2C1_SPEED=40000000
 CONFIG_SYS_MXC_I2C2_SPEED=40000000