v3dv: fix texture_size()

The uniform data for the texture size as produced by the compiler
contains the texture index directly and is not packed with
v3d_unit_data_create, so using v3d_unit_data_get_unit is not
correct.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10951>

src/broadcom/vulkan/v3dv_uniforms.c

@@ -352,7 +352,8 @@ get_texture_size(struct v3dv_cmd_buffer *cmd_buffer,
                  enum quniform_contents contents,
                  uint32_t data)
 {
-   uint32_t texture_idx = v3d_unit_data_get_unit(data);
+   uint32_t texture_idx = data;
+
    struct v3dv_descriptor_state *descriptor_state =
       v3dv_cmd_buffer_get_descriptor_state(cmd_buffer, pipeline);