On pre 4.15 host kernels, an APIC window emulation bug can cause qemu
to hang. On 64 bit we can use the x2apic, for 32 bit, we just have to
disable the other timer sources and rely on kvm-clock.
[YOCTO #12301]
(From OE-Core rev: 82e67b82ea8e12aa0b7b9db1d84fec0436dec71b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>