the Intel i6300esb is QEMU's default watchdog. And unlike
the real "Intel i6300ESB I/O Controller hub" hardware, the
i6300esb watchdog driver works on non-x86 targets like for
ARM (armvirt 32bit) and potentially virtual PowerPC and MIPS
targets (if there was any).
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>