amd: change chip_class naming to "enum amd_gfx_level gfx_level"

This aligns the naming with PAL.

Acked-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Acked-by: Pierre-Eric Pellou-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16469>

src/amd/compiler/aco_interface.cpp

@@ -212,7 +212,7 @@ aco_compile_shader(const struct radv_nir_compiler_options* options,
    aco::insert_wait_states(program.get());
    aco::insert_NOPs(program.get());
 
-   if (program->chip_class >= GFX10)
+   if (program->gfx_level >= GFX10)
       aco::form_hard_clauses(program.get());
 
    if (program->collect_statistics || (aco::debug_flags & aco::DEBUG_PERF_INFO))