armv8: ls1043a: Drop macro CONFIG_LS1043A

Use CONFIG_ARCH_LS1043A instead.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/drivers/net/fm/Makefile b/drivers/net/fm/Makefile
index fa96bad..fc7a6da 100644
--- a/drivers/net/fm/Makefile
+++ b/drivers/net/fm/Makefile
@@ -34,5 +34,5 @@
 obj-$(CONFIG_ARCH_T4160) += t4240.o
 obj-$(CONFIG_ARCH_B4420) += b4860.o
 obj-$(CONFIG_ARCH_B4860) += b4860.o
-obj-$(CONFIG_LS1043A)	+= ls1043.o
+obj-$(CONFIG_ARCH_LS1043A)	+= ls1043.o
 obj-$(CONFIG_ARCH_LS1046A)	+= ls1046.o