pinctrl: amd: fix incorrect way to disable debounce filter

The correct way to disable debounce filter is to clear bit 5 and 6
of the register.

Cc: stable@vger.kerne.org
Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/linux-gpio/df2c008b-e7b5-4fdd-42ea-4d1c62b52139@redhat.com/
Link: https://lore.kernel.org/r/20201105231912.69527-2-coiby.xu@gmail.com


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