Report recoverable errors as warnings

At present many recoverable failures are reported as errors. This patch
modifies all such failures to be reported as warnings instead.

Change-Id: I5141653c82498defcada9b90fdf7498ba496b2f2
diff --git a/plat/fvp/plat_io_storage.c b/plat/fvp/plat_io_storage.c
index 768c3c5..359af7d 100644
--- a/plat/fvp/plat_io_storage.c
+++ b/plat/fvp/plat_io_storage.c
@@ -234,7 +234,7 @@
 	int result = IO_FAIL;
 	void *local_image_spec = &bl33_file_spec;
 
-	INFO("Loading BL33 (UEFI)\n");
+	INFO("Loading BL33 (Normal world firmware)\n");
 	/* FIP first then fall back to semi-hosting */
 	result = open_fip(local_image_spec);
 	if (result == IO_SUCCESS) {