drm/xe: Fix typo persitent->persistent

Fix typo as noticed by Matt Roper:

	git grep -l persitent | xargs sed -i 's/persitent/persistent/g'

... and then fix coding style issues.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://lore.kernel.org/r/20230302013411.3262608-2-lucas.demarchi@intel.com


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