pinctrl: nuvoton: Fix sparse warning

Sparse complains:
drivers/pinctrl/nuvoton/pinctrl-wpcm450.c:626:9:
sparse: sparse: obsolete array initializer, use C99 syntax

This is because no equal sign is between the array index
and the assignments, in the macro.

Fix it up.

Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>