drm/i915: Nuke dev_priv->irq_port[]

Instead of looping over ports and hpd_pins, let's loop over
the encoders when doing hotplug processing. And instead of
depending on dev_priv->irq_port[] to tell us whether the
encoder has the ->hpd_pulse() hook or not, we can just
check for that directly. So we can just nuke irq_port[] entirely.

Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Rodrigo Vivi <[email protected]>

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