ARM: spear: fix typos in comments

Various spelling mistakes in comments.
Detected with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Link: https://lore.kernel.org/r/20220318103729.157574-21-Julia.Lawall@inria.fr

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>