drm/xe: Sort xe_regs.h

Sort it by register address to make it easy to update when needed.

v2: Do not create exception for registers with same functionality.
Always sort it.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20230726160708.3967790-11-lucas.demarchi@intel.com


Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>