armv8: ls2080a: Drop macro CONFIG_LS2080A

Use CONFIG_ARCH_LS2080A instead.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/drivers/net/ldpaa_eth/Makefile b/drivers/net/ldpaa_eth/Makefile
index 5587aa6..08675ec 100644
--- a/drivers/net/ldpaa_eth/Makefile
+++ b/drivers/net/ldpaa_eth/Makefile
@@ -6,4 +6,4 @@
 
 obj-y += ldpaa_wriop.o
 obj-y += ldpaa_eth.o
-obj-$(CONFIG_LS2080A) += ls2080a.o
+obj-$(CONFIG_ARCH_LS2080A) += ls2080a.o