drm/xe: expose PAT software config to debugfs

The existing "pat" debugfs node dumps the live PAT registers. Under
SR-IOV the VF cannot touch those registers, so the file vanishes and
users lose all PAT visibility. Add a VF-safe "pat_sw_config" entry to
the VF-safe debugfs list. It prints the cached PAT table the driver
programmed, rather than poking HW, so PF and VF instances present the
same view.

This lets IGT and other tools query the PAT configuration without
carrying platform-specific tables or mirroring kernel logic.

v2: (Jonathan)
- Only append "(* = reserved entry)" to the PAT table header on Xe2+
  platforms where it actually applies.
- Deduplicate the PTA/ATS mode printing by introducing the small
  drm_printf_pat_mode() helper macro.

v3: (Matt)
- Print IDX[XE_CACHE_NONE_COMPRESSION] on every Xe2+ platform so the
  dump always reflects the value the driver might use (even if it defaults
  to 0) and future IP revisions don’t need extra condition tweaks.

v4:
- Drop the drm_printf_pat_mode macro and introduce a real helper
  xe2_pat_entry_dump(). (Jani)
- Reuse the helper across all PTA/ATS/PAT dumps for xe2+ entries to keep
  output format identical.

v5: (Matt)
- Split the original patch into two: one for refactoring helpers, one for
  the new debugfs entry.

CC: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Xin Wang <x.wang@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patch.msgid.link/20251205070633.28072-1-x.wang@intel.com

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