kernel: drm/nouveau/kms/nv50-: init hpd_irq_lock for PIOR DP

A flaw was found in the Linux kernel's nouveau graphics driver for NVIDIA GPUs. The hpdirqlock spinlock is not initialized for PIOR Parallel Interface Output Resource DisplayPort connectors. This missing initialization causes a kernel oops on systems with ANX9805 DP encoders when hotplug detectio...