drm/i915/wm: Consolidate SAGV pipe active/interlace checks to common code

There are no differences between the platforms when
considering whether SAGV can be used when the pipe is
inactive or using an interlaced mode. Consolidate the
checks to common code.

Note that we weren't even checking for interlaced modes
on TGL+, but since we've previously soft defeatured
interlaced modes on TGL+ that was more or less fine.
The hardware does still have the capability though,
and in case we ever decide to resurrect it having the
check seems like a good idea.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260324134843.2364-4-ville.syrjala@linux.intel.com
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>

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