radv: store the list of attachments for every subpass

This reworks how the depth stencil attachment is used for
simplicity. This also introduces radv_render_pass_compile()
helper that will be used for further optimizations.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_meta_resolve_fs.c

@@ -620,7 +620,7 @@ radv_cmd_buffer_resolve_subpass_fs(struct radv_cmd_buffer *cmd_buffer)
 		struct radv_subpass resolve_subpass = {
 			.color_count = 1,
 			.color_attachments = (struct radv_subpass_attachment[]) { dest_att },
-			.depth_stencil_attachment = { .attachment = VK_ATTACHMENT_UNUSED },
+			.depth_stencil_attachment = NULL,
 		};
 
 		radv_cmd_buffer_set_subpass(cmd_buffer, &resolve_subpass);