drm/i915/pvc: skip all copy engines from aux table invalidate

As we have more copy engines now, mask all of them from aux table
invalidate.

v2 (MattR):
 - Use I915_MAX_BCS to determine mask rather than hardcoding BCS8.
   (Prathap)

Cc: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220505213812.3979301-12-matthew.d.roper@intel.com