hv: pirq: remove unnecessary dev_handler_node struct

Since we don't support shared irq, dev_handler_node which works as action node,
is not needed anymore.

This commit removes the dev_handler_node struct and does some relevant changes,
including:
 - moves necessary fields to struct irq_desc: action, priv_data, name; and
   removes unused handler_data;
 - changes return type of pri_/normal_register_handler() from dev_handler_node*
   to int32_t, which is irq num (>= 0) on success, and errno (> 0) on failure.
 - changes unregister_irq_handler() to take argument unint32_t instead of
   dev_handler_node*;
 - changes are made to the places where these APIs are called.

Signed-off-by: Yan, Like <like.yan@intel.com>
Reviewed-by: Eddie Dong  <eddie.dong@intel.com>

hypervisor/include/common/ptdev.h

@@ -51,7 +51,7 @@ struct ptdev_remapping_info {
 	uint16_t phys_bdf;	/* PCI bus:slot.func*/
 	uint32_t active;	/* 1=active, 0=inactive and to free*/
 	enum ptdev_intr_type type;
-	struct dev_handler_node *node;
+	uint32_t allocated_pirq;
 	struct list_head softirq_node;
 	struct list_head entry_node;