lantiq: pcie: fix inverted gpio reset logic

lantiq: pcie: fix inverted gpio reset logic

Asserting the reset should be logic 1 and subsequently deasserting the
reset should be logic 0.

While at it remove the calls to gpio_direction_output(). While getting
the GPIO the direction is already set.

Signed-off-by: Mathias Kresin <dev@kresin.me>