drm/xe: Remove devcoredump readout of IPEIR

This register don't exist in gfx12+, so here dropping the readout
and print in devcoredump.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>