hv: minimize the case of "identifier reuse"

Identifier reuse may arise confusion. So should minimize the case of it
as much as possible. This patch is try to do this except the PCI related
module.

Tracked-On: #861
Signed-off-by: Li, Fei1 <fei1.li@intel.com>

hypervisor/include/public/acrn_common.h

@@ -468,7 +468,7 @@ struct acrn_set_ioreq_buffer {
  * the parameter for HC_SET_IRQLINE hypercall
  */
 struct acrn_irqline_ops {
-	uint32_t nr_gsi;
+	uint32_t gsi;
 	uint32_t op;
 } __aligned(8);