x86: if acpi=off, force setting the mmconf for fam10h
some BIOS only let AMD fam 10h handle bus0, and nvidia mcp55/ck804 to handle other buses. at that case MCFG will cover all over them. but with acpi=off, we can not use MCFG. this patch will double check the busnbits, and if it is less handling 256 bues, and acpi=off will forcely reset the mmconf in msr, so we still use mmconf in above case. Signed-off-by: Yinghai Lu <yinghai.lu@sun.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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