agx: Handle bindless samplers

Unified encoding.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26056>

src/asahi/compiler/agx_compile.c

@@ -1716,6 +1716,7 @@ agx_emit_tex(agx_builder *b, nir_tex_instr *instr)
          texture = index;
          break;
       case nir_tex_src_sampler_offset:
+      case nir_tex_src_sampler_handle:
          sampler = index;
          break;