armv8: ls1043a: Drop macro CONFIG_LS1043A

Use CONFIG_ARCH_LS1043A instead.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Makefile b/arch/arm/cpu/armv8/fsl-layerscape/Makefile
index 04354d7..e3ce018 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Makefile
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Makefile
@@ -26,7 +26,7 @@
 obj-$(CONFIG_SYS_HAS_SERDES) += ls2080a_serdes.o
 endif
 
-ifneq ($(CONFIG_LS1043A),)
+ifneq ($(CONFIG_ARCH_LS1043A),)
 obj-$(CONFIG_SYS_HAS_SERDES) += ls1043a_serdes.o
 obj-$(CONFIG_ARMV8_PSCI) += ls1043a_psci.o
 endif