Change test targets to use _p9 if p9 is enabled.

lisafs is default. So we should not have all targets be generated
with _lisafs. Also if nothing is specified, then lisafs should run.
Which is not the case right now.

PiperOrigin-RevId: 469770835

test/runner/defs.bzl

@@ -84,8 +84,8 @@ def _syscall_test(
         name += "_overlay"
     if fuse:
         name += "_fuse"
-    if lisafs:
-        name += "_lisafs"
+    if not lisafs:
+        name += "_p9"
     if network != "none":
         name += "_" + network + "net"