ddr: fsl: Merge macro CONFIG_NUM_DDR_CONTROLLERS and CONFIG_SYS_NUM_DDR_CTRLS

These two macros are used for the same thing, the total number of DDR
controllers for a given SoC. Use SYS_NUM_DDR_CTRLS in Kconfig and
merge existing usage.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/include/configs/B4860QDS.h b/include/configs/B4860QDS.h
index e5c220e..3ad9f80 100644
--- a/include/configs/B4860QDS.h
+++ b/include/configs/B4860QDS.h
@@ -62,7 +62,7 @@
 #endif
 
 #define CONFIG_SYS_FSL_CPC		/* Corenet Platform Cache */
-#define CONFIG_SYS_NUM_CPC		CONFIG_NUM_DDR_CONTROLLERS
+#define CONFIG_SYS_NUM_CPC		CONFIG_SYS_NUM_DDR_CTLRS
 #define CONFIG_FSL_IFC			/* Enable IFC Support */
 #define CONFIG_FSL_CAAM			/* Enable SEC/CAAM */
 #define CONFIG_PCIE1			/* PCIE controller 1 */