kvm: i386: fix LAPIC TSC deadline timer save/restore

The configuration of the timer represented by MSR_IA32_TSCDEADLINE depends on:

- APIC LVT Timer register.
- TSC value.

Change the order to respect the dependency.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>