Explicitly include asm/realmode.h, which provides reserve_real_mode(),
instead of picking it up by an indirect include of asm/acpi.h.  acpi.h
will soon stop including realmode.h so that changing realmode.h doesn't
require a full kernel rebuild.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Link: https://lkml.kernel.org/r/20191126165417.22423-3-sean.j.christopherson@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>