[Tow-Boot] sandbox: Disable accelerated rendering

Somehow I must be doing something wrong with my setup, but it won't find
the EGL context. To be investigated I suppose.

Author: samueldr

arch/sandbox/cpu/sdl.c

@@ -164,9 +164,7 @@ int sandbox_sdl_init_display(int width, int height, int log2_bpp,
 		       SDL_GetError());
 		return -EIO;
 	}
-	sdl.renderer = SDL_CreateRenderer(sdl.screen, -1,
-					  SDL_RENDERER_ACCELERATED |
-					  SDL_RENDERER_PRESENTVSYNC);
+	sdl.renderer = SDL_CreateRenderer(sdl.screen, -1, SDL_RENDERER_SOFTWARE);
 	if (!sdl.renderer) {
 		printf("Unable to initialise SDL renderer: %s\n",
 		       SDL_GetError());