drm/i915/mtl: Initial display workarounds

This patch introduces initial workarounds for mtl platform

v2: switch IS_MTL_DISPLAY_STEP to use IS_METEORLAKE from testing display
ver. (Tvrtko)

v3: clerical issues, extend 16015201720 to mtl. (MattR)

v4: make sure 16015201720 includes display 13. (MattR)

Bspec: 66624

Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221209220543.502047-1-matthew.s.atwood@intel.com