drm/i915/hdmi: Restructure the sink/output format selection

intel_hdmi_compute_output_format() is a bit of a mess. Try to
restructure it into a more readable form.

Right now we basically have two main code paths:
- YCbCr 4:2:0 only modes
- everything else including YCbCr 4:2:0 also modes

Those two basically do the same two steps (try 4:2:0 and try 4:4:4)
but in opposite orders. Let's write that out in a more explicit
if-else form. And since I'm running out of function names I'll
rename the function with that high level logic into
intel_hdmi_compute_formats() and it will call (the new)
intel_hdmi_compute_output_format() with an explicit sink_format
as needed.

Cc: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260409101539.22032-3-ville.syrjala@linux.intel.com
Tested-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>

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