[hip] Remove `hip_pinned_shadow`.

[hip] Remove `hip_pinned_shadow`.

Summary:
- Use `device_builtin_surface` and `device_builtin_texture` for
  surface/texture reference support. So far, both the host and device
  use the same reference type, which could be revised later when
  interface/implementation is stablized.

Reviewers: yaxunl

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D77583