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/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index 5c43063..9651acc 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -379,7 +379,7 @@
 	mfspr	r13,SPRN_SPRG_PACA	/* get our PACA */
 	b	system_call_common
 
-/* Auxillary Processor Unavailable Interrupt */
+/* Auxiliary Processor Unavailable Interrupt */
 	START_EXCEPTION(ap_unavailable);
 	NORMAL_EXCEPTION_PROLOG(0xf20, PROLOG_ADDITION_NONE)
 	EXCEPTION_COMMON(0xf20, PACA_EXGEN, INTS_KEEP)