drm/xe: Drop EXECLIST_CONTROL from error state dump

EXECLIST_CONTROL ($enginebase + 0x550) is a write-only register; we
shouldn't be trying to read or report it as part of the device error
state.

Bspec: 45910, 60335
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://lore.kernel.org/r/20231109194606.1835284-2-matthew.d.roper@intel.com


Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>