apic: Open-code timer save/restore
To enable migration between accelerated and non-accelerated APIC models,
we will need to handle the timer saving and restoring specially and can
no longer rely on the automatics of VMSTATE_TIMER. Specifically,
accelerated model will not start any QEMUTimer.
This patch therefore factors out the generic bits into apic_next_timer
and use a post-load callback to implemented model-specific logic.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
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