ipmid: host-cmd-manager to use default event source for timers

The sdbusplus/timer.hpp class can be passed an event, but by default, it
just uses the default system event queue. This updates the
host-cmd-manager Manager class to use the defaults.

Tested-by: Send the heartbeat command with the host powered off and
           watch for a timeout message:

    dbus-send --print-reply --system \
    --dest=xyz.openbmc_project.Ipmi.Host \
    /xyz/openbmc_project/control/host0 \
    xyz.openbmc_project.Control.Host.Execute \
    string:"xyz.openbmc_project.Control.Host.Command.Heartbeat"

    Watch the log (journalctl -f):

    Nov 27 00:34:52 wolfpass ipmid[1255]: Pushing cmd on to queue
    Nov 27 00:34:52 wolfpass ipmid[1255]: Pushing cmd on to queue
    Nov 27 00:34:52 wolfpass ipmid[1255]: Asserting SMS Attention
    Nov 27 00:34:52 wolfpass ipmid[1255]: SMS Attention asserted
    Nov 27 00:35:23 wolfpass ipmid[1255]: Host control timeout hit!

Change-Id: I904d34b67050723a9c7e405bda4e02f1a9cb4dbd
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/ipmid.cpp b/ipmid.cpp
index cb92175..11d6796 100644
--- a/ipmid.cpp
+++ b/ipmid.cpp
@@ -656,8 +656,7 @@
     sdbusp = std::make_unique<sdbusplus::bus::bus>(bus);
     sdbusp->request_name("xyz.openbmc_project.Ipmi.Host");
 
-    cmdManager =
-        std::make_unique<phosphor::host::command::Manager>(*sdbusp, events);
+    cmdManager = std::make_unique<phosphor::host::command::Manager>(*sdbusp);
 
     // Activate OemRouter.
     oem::mutableRouter()->activate();