spl: Rename SYS_SPL_ARGS_ADDR to SPL_PAYLOAD_ARGS_ADDR

Rename this so that SPL is first, as per U-Boot convention. Also add
PAYLOAD_ since this is where in memory the parameters for the payload
have been stored.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/spl/spl_fat.c b/common/spl/spl_fat.c
index f8a5b80..c6e2526 100644
--- a/common/spl/spl_fat.c
+++ b/common/spl/spl_fat.c
@@ -128,7 +128,7 @@
 #if defined(CONFIG_SPL_ENV_SUPPORT) && defined(CONFIG_SPL_OS_BOOT)
 	file = env_get("falcon_args_file");
 	if (file) {
-		err = file_fat_read(file, (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
+		err = file_fat_read(file, (void *)CONFIG_SPL_PAYLOAD_ARGS_ADDR, 0);
 		if (err <= 0) {
 			printf("spl: error reading image %s, err - %d, falling back to default\n",
 			       file, err);
@@ -153,7 +153,7 @@
 #endif
 
 	err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
-			    (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
+			    (void *)CONFIG_SPL_PAYLOAD_ARGS_ADDR, 0);
 	if (err <= 0) {
 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 		printf("%s: error reading image %s, err - %d\n",