xen: do not initialize the interval timer and PCSPK emulator
PIT and PCSPK are emulated by the hypervisor so we don't need to emulate
them in Qemu: this patch prevents Qemu from waking up needlessly at
PIT_FREQ on Xen.
Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
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