ggml-virtgpu: make the code thread safe (#19204)

* ggml-virtgpu: regenerate_remoting.py: add the ability to deprecate a function

* ggml-virtgpu: deprecate buffer_type is_host remoting

not necessary

* ggml-virtgpu: stop using static vars as cache

The static init isn't thread safe.

* ggml-virtgpu: protect the use of the shared memory to transfer data

* ggml-virtgpu: make the remote calls thread-safe

* ggml-virtgpu: backend: don't continue if couldn't allocate the tensor memory

* ggml-virtgpu: add a cleanup function for consistency

* ggml-virtgpu: backend: don't crash if buft->iface.get_max_size is missing

* fix style and ordering

* Remove the static variable in apir_device_get_count

* ggml-virtgpu: improve the logging

* fix review minor formatting changes

ggml/src/ggml-virtgpu/virtgpu-shm.cpp

@@ -85,8 +85,7 @@ int virtgpu_shmem_create(virtgpu * gpu, size_t size, virtgpu_shmem * shmem) {
     void * ptr = virtgpu_ioctl_map(gpu, gem_handle, size);
     if (!ptr) {
         virtgpu_ioctl_gem_close(gpu, gem_handle);
-        GGML_LOG_ERROR("virtgpu_ioctl_map FAILED\n");
-        exit(1);
+        GGML_LOG_ERROR(GGML_VIRTGPU "%s: virtgpu_ioctl_map failed\n", __func__);
         return 1;
     }