Convert CONFIG_CHIP_SELECTS_PER_CTRL to Kconfig

This converts the following to Kconfig:
   CONFIG_CHIP_SELECTS_PER_CTRL

Cc: Alison Wang <alison.wang@nxp.com>
Cc: Pramod Kumar <pramod.kumar_1@nxp.com>
Cc: Priyanka Jain <priyanka.jain@nxp.com>
Cc: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Cc: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index 2ded3e4..177f568 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -8,7 +8,6 @@
 #include <clock_legacy.h>
 #include <cpu_func.h>
 #include <env.h>
-#include <fsl_ddr_sdram.h>
 #include <init.h>
 #include <hang.h>
 #include <log.h>
@@ -36,6 +35,7 @@
 #endif
 #include <asm/armv8/sec_firmware.h>
 #ifdef CONFIG_SYS_FSL_DDR
+#include <fsl_ddr_sdram.h>
 #include <fsl_ddr.h>
 #endif
 #include <asm/arch/clock.h>
@@ -1632,12 +1632,14 @@
 
 __weak int dram_init(void)
 {
+#ifdef CONFIG_SYS_FSL_DDR
 	fsl_initdram();
 #if (!defined(CONFIG_SPL) && !defined(CONFIG_TFABOOT)) || \
 	defined(CONFIG_SPL_BUILD)
 	/* This will break-before-make MMU for DDR */
 	update_early_mmu_table();
 #endif
+#endif
 
 	return 0;
 }