armv8/ls1043a: enable workaround for errarum A009942

DDR erratum A-009942 applies to LS1043A.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/include/asm/arch-fsl-layerscape/config.h

@@ -177,6 +177,7 @@
 
 #define CONFIG_SYS_FSL_ERRATUM_A009663
 #define CONFIG_SYS_FSL_ERRATUM_A009929
+#define CONFIG_SYS_FSL_ERRATUM_A009942
 #else
 #error SoC not defined
 #endif