Fix the pin function names for MPP54 and MPP55.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Link: https://lore.kernel.org/r/20210216113118.17484-2-kostap@marvell.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>