of: Clarify OF device context in of_match_device() comment

of: Clarify OF device context in of_match_device() comment

Open Firmware abbreviation (OF) in of_match_device() comment is written
in lowercase instead, which is mistaken for prepositional word "of"
([1], [2], [3], [4]) duplicate.

Clarify the context.

Link: https://lore.kernel.org/all/CAL_JsqLypcBCOVZ8yYWK0J_xc2Vcr+ANrX_3v4vN55Srp4RknQ@mail.gmail.com/
Link: https://lore.kernel.org/all/20220926185852.GA2581083-robh@kernel.org/
Link: https://lore.kernel.org/all/CAL_JsqL4GvgFYzGUfhW5pvm4wYGrFaj6gHOYZjnOMuk2zCz67w@mail.gmail.com/
Link: https://lore.kernel.org/all/20220627173825.GA2637590-robh@kernel.org/
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20250730013113.11264-1-bagasdotme@gmail.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>