drm/i915: combine i9xx_get_hpd_pins and pch_get_hpd_pins
These functions are quite similar, so combine them with the use of a new argument for a function that detects long pulses. This will be also needed by an upcoming patch adding support for BXT long pulse detection. No functional change. v2: - rebase on top -nightly (Daniel) Signed-off-by: NImre Deak <imre.deak@intel.com> Reviewed-by: NSonika Jindal <sonika.jindal@intel.com> Reviewed-by: NSivakumar Thulasimani <sivakumar.thulasimani@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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