nir: remove subgroup size related nir_shader_compiler_options members

This was added with the goal to eventually replace the per
pass subgroup/ballot size options, but that won't work because
some backends don't have a fixed subgroup size across the compilation
process.

It was also mostly added to hack around mesa state tracker behavior,
and we have a better solution there now.

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37164>

src/asahi/compiler/agx_compile.h

@@ -406,7 +406,4 @@ static const nir_shader_compiler_options agx_nir_options = {
    .discard_is_demote = true,
    .scalarize_ddx = true,
    .io_options = nir_io_always_interpolate_convergent_fs_inputs,
-   .subgroup_size = 32,
-   .ballot_bit_size = 32,
-   .ballot_components = 1,
 };

src/compiler/nir/nir_shader_compiler_options.h

@@ -787,14 +787,6 @@ typedef struct nir_shader_compiler_options {
     */
    unsigned skip_lower_packing_ops;
 
-   /* In case the exact subgroup size is not known, subgroup_size should be
-    * set to 0. In that case, the maximum subgroup size will be calculated by
-    * ballot_components * ballot_bit_size.
-    */
-   uint8_t subgroup_size;
-   uint8_t ballot_bit_size;
-   uint8_t ballot_components;
-
    /** Driver callback where drivers can define how to lower mediump.
     *  Used by nir_lower_io_passes.
     */