drm/xe/hw_error: Cleanup array map

drm/xe/hw_error: Cleanup array map

xe_hw_error_map[] is not worth the memory needed to map two components.
Clean it up and use switch() instead, which also, in turn, simplifies
bounds checking logic.

add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-425 (-425)
Function                                     old     new   delta
xe_hw_error_map                              136       -    -136
xe_hw_error_irq_handler                     3728    3439    -289
Total: Before=7700, After=7275, chg -5.52%

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patch.msgid.link/20260502180143.1450266-1-raag.jadav@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>