ipmi: Add a local BMC simulation

This provides a minimal local BMC, basically enough to comply with the
spec and provide a complete watchdog timer (including a sensor, SDR,
and event).
Signed-off-by: NCorey Minyard <cminyard@mvista.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

default-configs/i386-softmmu.mak

@@ -10,6 +10,7 @@ CONFIG_VMWARE_VGA=y
 CONFIG_VIRTIO_VGA=y
 CONFIG_VMMOUSE=y
 CONFIG_IPMI=y
+CONFIG_IPMI_LOCAL=y
 CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y

default-configs/x86_64-softmmu.mak

@@ -10,6 +10,7 @@ CONFIG_VMWARE_VGA=y
 CONFIG_VIRTIO_VGA=y
 CONFIG_VMMOUSE=y
 CONFIG_IPMI=y
+CONFIG_IPMI_LOCAL=y
 CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y

hw/ipmi/Makefile.objs

 common-obj-$(CONFIG_IPMI) += ipmi.o
+common-obj-$(CONFIG_IPMI_LOCAL) += ipmi_bmc_sim.o