Switch back to port 0

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Cleanup the FIQ code

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Update IRQ handler with recent FIQ changes

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>