Support different log levels.

This will let us add more verbose logs for debugging but have them
compiled out most of the time.

Change-Id: Iaae468e41025a165b5e67fa6fec5422f004c6a44
diff --git a/src/manifest.c b/src/manifest.c
index 93560c5..db01612 100644
--- a/src/manifest.c
+++ b/src/manifest.c
@@ -286,7 +286,7 @@
 	}
 
 	if (uint32list_has_next(&smcs)) {
-		dlog("%s SMC whitelist too long.\n", vm->debug_name);
+		dlog_warning("%s SMC whitelist too long.\n", vm->debug_name);
 	}
 
 	TRY(read_bool(node, "smc_whitelist_permissive",