checkpatch: update section keywords

As of commit bd721ea ("treewide: replace obsolete _refok by
__ref"), __init_refok no longer exists, so it can be removed.  While at
it, add the modern variants that were still missing.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>
Acked-by: Joe Perches <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: geertu

scripts/checkpatch.pl

@@ -346,9 +346,10 @@ sub hash_show_words {
 			__force|
 			__iomem|
 			__must_check|
-			__init_refok|
 			__kprobes|
 			__ref|
+			__refconst|
+			__refdata|
 			__rcu|
 			__private
 		}x;