By default SCI is disabled after power on. ACTL is the register to
enable SCI and route it to PIC/APIC. To support both ACPI in PIC
mode and APIC mode, configure SCI to use IRQ9.
Signed-off-by: Bin Meng <email@example.com>
Reviewed-by: Stefan Roese <firstname.lastname@example.org>
Tested-by: Stefan Roese <email@example.com>