Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/arm/include/asm/glue-cache.h b/arch/arm/include/asm/glue-cache.h
index c7afbc5..7e30874 100644
--- a/arch/arm/include/asm/glue-cache.h
+++ b/arch/arm/include/asm/glue-cache.h
@@ -126,7 +126,7 @@
 #endif
 
 #if !defined(_CACHE) && !defined(MULTI_CACHE)
-#error Unknown cache maintainence model
+#error Unknown cache maintenance model
 #endif
 
 #ifndef MULTI_CACHE