color-lcms: refactor away setup_seach_param()

To me, the use of setup_search_param() makes the code harder to
understand than it needs to be. Replacing that function with open-coding
the struct cmlcms_color_transform_search_param initialization makes it
more clear that:

- get_surface_color_transform is the only one that actually uses a
  surface to initialize it

- get_blend_to_output does not use an input profile at all

- get_sRGB_to_output and get_sRGB_to_blend hardcode the sRGB profile
  like they should

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>