ipmi/sim: fix watchdog_expired data type error in IPMIBmcSim struct

1) watchdog_expired is set bool which value could only be 0 or 1,
but watchdog_expired every bit mean different Timer Use.

2) Use the command  -ipmitool mc get watchdog-  to query
ipmi-watchdog status in guest.
...
[root@localhost ~]# ipmitool mc watchdog get
Watchdog Timer Use:     SMS/OS (0x44)
Watchdog Timer Is:      Started/Running
Watchdog Timer Actions: Hard Reset (0x01)
Pre-timeout interval:   0 seconds
Timer Expiration Flags: 0x00
Initial Countdown:      60 sec
Present Countdown:      57 sec
...
bool for watchdog_expired results -Timer Expiration Flags- always
be 0x00 or 0x01, but the -Timer Expiration Flags- indicts the Timer Use
after timeout. So change watchdog_expired data type from bool to uint8_t
to fix this problem.

Signed-off-by: Jinhua Cao <caojinhua1@huawei.com>
Message-Id: <20210625021232.73614-1-caojinhua1@huawei.com>
[I checked, a bool and uint8 are the same size for the vmstate transfer,
 so this should be fine.]
Signed-off-by: Corey Minyard <cminyard@mvista.com>

hw/ipmi/ipmi_bmc_sim.c

@@ -189,7 +189,7 @@ struct IPMIBmcSim {
     uint8_t  watchdog_use;
     uint8_t  watchdog_action;
     uint8_t  watchdog_pretimeout; /* In seconds */
-    bool     watchdog_expired;
+    uint8_t  watchdog_expired;
     uint16_t watchdog_timeout; /* in 100's of milliseconds */
 
     bool     watchdog_running;
@@ -2110,7 +2110,7 @@ static const VMStateDescription vmstate_ipmi_sim = {
         VMSTATE_UINT8(watchdog_use, IPMIBmcSim),
         VMSTATE_UINT8(watchdog_action, IPMIBmcSim),
         VMSTATE_UINT8(watchdog_pretimeout, IPMIBmcSim),
-        VMSTATE_BOOL(watchdog_expired, IPMIBmcSim),
+        VMSTATE_UINT8(watchdog_expired, IPMIBmcSim),
         VMSTATE_UINT16(watchdog_timeout, IPMIBmcSim),
         VMSTATE_BOOL(watchdog_running, IPMIBmcSim),
         VMSTATE_BOOL(watchdog_preaction_ran, IPMIBmcSim),