hv: fix possible buffer overflow issues

- cpu_secondary_init() @cpu.c
 - ptirq_intx_pin_remap() @ assign.c
   etc.

Tracked-On: #1252
Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/include/public/acrn_common.h

@@ -626,7 +626,7 @@ enum pm_cmd_type {
  *
  * the parameter for HC_VM_INTR_MONITOR hypercall
  */
-#define MAX_PTDEV_NUM 24
+#define MAX_PTDEV_NUM 24U
 struct acrn_intr_monitor {
 	/** sub command for intr monitor */
 	uint32_t cmd;