[runtimes] Rename newformat to just format, now that the old format has been removed

GitOrigin-RevId: 70f6389257a85a8fa7f128a05a1ccbd0dbba191c
diff --git a/test/lit.site.cfg.in b/test/lit.site.cfg.in
index 64d945d..d0f0e08 100644
--- a/test/lit.site.cfg.in
+++ b/test/lit.site.cfg.in
@@ -48,8 +48,8 @@
 # Infer the test_exec_root from the build directory.
 config.test_exec_root = os.path.join(config.libunwind_obj_root, 'test')
 
-import libcxx.test.newformat
-config.test_format = libcxx.test.newformat.CxxStandardLibraryTest()
+import libcxx.test.format
+config.test_format = libcxx.test.format.CxxStandardLibraryTest()
 
 lit_config.note('Using configuration variant: libunwind')
 import libunwind.test.config