[PATCH v2] sandbox: fix a compilation error

[Sergei Antonov]

On Tue, 13 Jun 2023 at 17:58, Simon Glass <sjg at chromium.org> wrote:
> The problem with this is it then cannot be built on non-sandbox
> boards. I think v1 was OK.

Before the patch as well as after the patch:
if CONFIG_SANDBOX_SDL
  declaration of sandbox_sdl_set_bpp()
else
  definition of sandbox_sdl_set_bpp() returning error
end
This patch only moves code to another header file in arch/sandbox/include/asm.
How can a non-sandbox build fail because of this patch?