[rmuthiah]

vhost-device-vsock: Sync base rev and patches with upstream PR #936 and PR #1007

Bump vhost_device_vsock_crates in vhost_device_vsock.MODULE.bazel
from 20fa14c4c56e40a12104794a934dd70dc7642ff2 to
c0bfee92d28ffa7199ebe894c16d877a6f216fc3, which includes:

• b269fab (Update vhost-user-backend to 0.24.0, vhost 0.18.0,
  containing rust-vmm/vhost PR Build(deps): Bump google.golang.org/grpc from 1.40.0 to 1.56.3 in /frontend/src/liboperator #374 e45799931a9e so device-state
  transfer returns Option<File>)
• c0bfee9 (rust-vmm/vhost-device PR Fix include paths and strip_include_prefix in //cuttlefish/host/commands/cvd #992: vsock: do forward-listen polling after guest accepts)

Refresh the four vhost-device-vsock patches against c0bfee92d28f to
match upstream rust-vmm/vhost-device PR #936 (0848db4..f0c024d) and
PR #1007 (1268ac5..7d2775e):

1. vhost-device-vsock-backend-rxq-cleanup.patch (PR Add missing include #1007 commit 1,
   1268ac5):

   • Add unit test in test_vsock_thread_backend verifying that stale
     backend_rxq keys are skipped and active keys with remaining
     pending_rx() ops are re-queued.

2. vhost-device-vsock-handshake-cleanup.patch (PR Add missing include #1007 commit 2,
   a8ad7a6):

   • Rebase onto c0bfee92d28f (PR Fix include paths and strip_include_prefix in //cuttlefish/host/commands/cvd #992), adding unit tests for
     early pre-handshake host disconnects and BrokenPipe on
     VSOCK_OP_RESPONSE.

3. vhost-device-vsock-snapshot.patch (PR Import libcuttlefish_host_config_adb #936 0848db4..f0c024d):

   • Persist 1-byte driver_read_config across set_device_state_fd
     and check_device_state so VSOCK_EVENT_TRANSPORT_RESET is only
     sent on restore if the guest driver had initialized the device
     before snapshot.
   • Replace Mutex<bool> with AtomicBool for
     transport_reset_pending and driver_read_config, lock threads
     before checking transport_reset_pending in get_config(), and
     check queue.ready() in reset_transport().
   • Add test_vsock_backend_save_restore unit test.

4. vhost-device-vsock-stream-io-error-reset.patch (PR Add missing include #1007 commit 3,
   7d2775e):

   • Add unit tests for WouldBlock on nonblocking streams and
     send_bytes write errors on closed host peers.

Bug: 483173919
Bug: 566997830
Test: bazel build //cuttlefish/package:common
Test: 5-stage live Cuttlefish VM vsock stress & snapshot-restore test
Assisted-by: Jetski:Gemini