configs: fsl: move DDR specific defines to Kconfig

Moves below DDR specific defines to Kconfig:

CONFIG_FSL_DDR_BIST
CONFIG_FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
CONFIG_FSL_DDR_INTERACTIVE
CONFIG_FSL_DDR_SYNC_REFRESH

Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
diff --git a/drivers/ddr/fsl/Kconfig b/drivers/ddr/fsl/Kconfig
index c5bd8a8..1b73df8 100644
--- a/drivers/ddr/fsl/Kconfig
+++ b/drivers/ddr/fsl/Kconfig
@@ -20,6 +20,18 @@
 	help
 		Access DDR registers in little-endian
 
+config FSL_DDR_BIST
+	bool
+
+config FSL_DDR_INTERACTIVE
+	bool
+
+config FSL_DDR_SYNC_REFRESH
+	bool
+
+config FSL_DDR_FIRST_SLOT_QUAD_CAPABLE
+	bool
+
 menu "Freescale DDR controllers"
 	depends on SYS_FSL_DDR