tools: add missing free statement in jailhouse tool

Signed-off-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
x86: Limit number of extended LVTs on AMD

If future hardware should decide to report more than 4 LVTs,
our apic_reserved_bits array would overflow when enabling all of them
in apic_cpu_init.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>