pinctrl: berlin: Drop superfluous ampersands

There is no need to use an ampersand to take the address of a function.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Jisheng Zhang <jszhang@kernel.org>
Link: https://lore.kernel.org/r/0ff17be9b31c9fcf03481c0665293b98ced741f7.1692871243.git.geert+renesas@glider.be


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