remove pw patch for old version

MODULE.bazel

diff --git a/MODULE.bazel b/MODULE.bazel
index fc8ac1c..2faf2f0 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -28,8 +28,6 @@
         # Allow integration_tests to build for armv7-m / armv7e-m so the
         # AST10x0 unittest_runner can use it.
         "//third_party/pigweed:integration_tests_armv7m.patch",
-        # Fix lost-wakeup race in ipc/user test USER signal round-trip.
-        "//third_party/pigweed:ipc_user_signal_race.patch",
     ],
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
 )

third_party/pigweed/ipc_user_signal_race.patch

diff --git a/third_party/pigweed/ipc_user_signal_race.patch b/third_party/pigweed/ipc_user_signal_race.patch
deleted file mode 100644
index 57b8859..0000000
--- a/third_party/pigweed/ipc_user_signal_race.patch
+++ /dev/null
@@ -1,14 +0,0 @@
---- a/pw_kernel/tests/ipc/user/handler.rs
-+++ b/pw_kernel/tests/ipc/user/handler.rs
-@@ -31,8 +31,9 @@
-         // USER signal means the initiator is pinging us; echo it back and lower it
-         // (level-triggered: the sender owns both raise and lower).
-         if wait_return.pending_signals.contains(Signals::USER) {
-             syscall::object_set_peer_user_signal(handle::IPC, true).map_err(|_| Error::Internal)?;
--            syscall::object_set_peer_user_signal(handle::IPC, false)
--                .map_err(|_| Error::Internal)?;
-+            // Do not lower: initiator may not have reached object_wait yet.
-+            // syscall::object_set_peer_user_signal(handle::IPC, false)
-+            //     .map_err(|_| Error::Internal)?;
-             return Ok(());
-         }