drm/i915: Replace the HAS_DDI() in intel_crtc_scanline_offset() with specific platfor...

drm/i915: Replace the HAS_DDI() in intel_crtc_scanline_offset() with specific platform checks

The HDMI vs. not scanline offset stuff no longer applies to the
latest platforms, so using HAS_DDI() is a bit confusing. Replace
with a more specific set of conditions.

Also let's just deal with the platform types in the if ladder
itself, and handle the HDMI vs. not within the specific branch
for those platforms.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250207215406.19348-4-ville.syrjala@linux.intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>