drm/i915: move generic hotplug code into new intel_hotplug.c file
We have enough generic hotplug functions sprinkled all over i915_irq.c to warrant moving them to a file of their own. This should further underline the distinction between generic code in the new file and platform specific hotplug and irq code that remains in i915_irq.c. Add new intel_hpd_init_work to keep work functions static, and rename get_port_from_pin to intel_hpd_pin_to_port while increasing its visibility, but keep everything else the same. Signed-off-by: NJani Nikula <jani.nikula@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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