Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index fd50ccd..ef8c454 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -216,7 +216,7 @@
 		       cpu, pcpu, cpu_status);
 	}
 
-	/* Isolation and deallocation are definatly done by
+	/* Isolation and deallocation are definitely done by
 	 * drslot_chrp_cpu.  If they were not they would be
 	 * done here.  Change isolate state to Isolate and
 	 * change allocation-state to Unusable.