rusticl/device: restrict param_max_size further

It's kinda pointless to have it too big, it also causes weird shaders to
be generated and causes stack overflows in `nir_opt_gcm`.

Nothing needs big values here anyway.

Cc: mesa-stable
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25837>

src/gallium/frontends/rusticl/core/device.rs

@@ -856,7 +856,7 @@ impl Device {
     pub fn param_max_size(&self) -> usize {
         min(
             self.shader_param(pipe_shader_cap::PIPE_SHADER_CAP_MAX_CONST_BUFFER0_SIZE) as u32,
-            32 * 1024,
+            4 * 1024,
         ) as usize
     }