Only set QEMU_CAPS_NO_HPET on x86
QEMU only supports it on x86, but we've been assuming it for all QEMUs when doing QMP capability detection. https://bugzilla.redhat.com/show_bug.cgi?id=1066145
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QEMU only supports it on x86, but we've been assuming it for all QEMUs when doing QMP capability detection. https://bugzilla.redhat.com/show_bug.cgi?id=1066145