drm/i915/adlp+: Add DSC early pixel count scaling WA (Wa_1409098942)

Add a workaround to fix timing issues on links with DSC enabled -
presumedly related to the audio functionality.

Bspec requires enabling this workaround if audio is enabled on ADLP,
however Windows enables it whenever DSC is enabled ADLP onwards; follow
Windows.

Bspec: 50490, 55424

v2: Fix WA code comment formatting. (Ankit)

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240129175533.904590-5-imre.deak@intel.com