Remove external fd import/export

No longer needed.

Change-Id: I49f31573ff1b49a7e4b2d0fd4521eb600bbd507d
diff --git a/src/intel/vulkan/anv_magma.cc b/src/intel/vulkan/anv_magma.cc
index 80b4747..32a9b2c 100644
--- a/src/intel/vulkan/anv_magma.cc
+++ b/src/intel/vulkan/anv_magma.cc
@@ -270,21 +270,14 @@
 
 int anv_gem_handle_to_fd(anv_device* device, anv_buffer_handle_t gem_handle)
 {
-   int fd;
-   auto result = magma_export_fd(magma_connection(device), gem_handle, &fd);
-   DASSERT(result == MAGMA_STATUS_OK);
-   return fd;
+   DASSERT(false);
+   return -1;
 }
 
 anv_buffer_handle_t anv_gem_fd_to_handle(anv_device* device, int fd, uint64_t* size_out)
 {
-   magma_buffer_t buffer;
-   magma_status_t status = magma_import_fd(magma_connection(device), fd, &buffer);
-   if (status != MAGMA_STATUS_OK)
-      return 0;
-
-   *size_out = magma_get_buffer_size(buffer);
-   return buffer;
+   DASSERT(false);
+   return 0;
 }
 
 int anv_gem_gpu_get_reset_stats(struct anv_device* device, uint32_t* active, uint32_t* pending)