pinctrl: mediatek: set array size for reg_cals

pinctrl: mediatek: set array size for reg_cals

Set the size of the reg_cals arrays to PINCTRL_PIN_REG_MAX to in all
affected mediatek pinctrl drivers. This is needed to avoid potential
out-of-bounds accesses when they is used in mtk_hw_pin_field_get().
All array members need to be initialized since the code loops from 0
to PINCTRL_PIN_REG_MAX - 1. mt7622_reg_cals was already defined this
way, but the others were not.

Signed-off-by: David Lechner <dlechner@baylibre.com>