drm/i915/selftests: fix typos in i915/selftests files

Fix all typos in files under drm/i915/selftests reported by codespell tool.

v2: Fix commenting style <Andi>

Signed-off-by: Nitin Gote <nitin.r.gote@intel.com>
Reviewed-by: Krzysztof Niemiec <krzysztof.niemiec@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250120081517.3237326-6-nitin.r.gote@intel.com


Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>