[driver][cleanup]

Remove unused include

Change-Id: I035fc8d9223e873ee09e00f6d2d01fde6d220832
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1152716
Fuchsia-Auto-Submit: Ian McKellar <[email protected]>
Reviewed-by: Suraj Malhotra <[email protected]>
Commit-Queue: Auto-Submit <[email protected]>

Author: ianloic

sdk/lib/fidl_driver/transport.cc

@@ -15,8 +15,6 @@
 #include <lib/fidl/cpp/wire/status.h>
 #include <zircon/errors.h>
 
-#include <optional>
-
 namespace fidl {
 namespace internal {