pc: make isapc and pc-0.10 to pc-0.13 have 1.7.0 memory layout

QEMU 2.0 changed memory layout for isapc and pc-0.10 to pc-0.13.
This prevents migration from QEMU 1.7.0 for these
machine types when -m 3.5G is specified.

Paolo Bonzini asked that:

    smbios_legacy_mode = true;
    has_reserved_memory = false;
    option_rom_has_mr = true;
    rom_file_has_mr = false;

also be done.

Cc: qemu-stable@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NDon Slutz <dslutz@verizon.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Fixes: https://bugs.launchpad.net/qemu/+bug/1334307Tested-by: N"Slutz, Donald Christopher" <dslutz@verizon.com>

hw/i386/pc_piix.c

@@ -392,6 +392,11 @@ static void pc_init_pci_no_kvmclock(MachineState *machine)
     has_pci_info = false;
     has_acpi_build = false;
     smbios_defaults = false;
+    gigabyte_align = false;
+    smbios_legacy_mode = true;
+    has_reserved_memory = false;
+    option_rom_has_mr = true;
+    rom_file_has_mr = false;
     x86_cpu_compat_disable_kvm_features(FEAT_KVM, KVM_FEATURE_PV_EOI);
     enable_compat_apic_id_mode();
     pc_init1(machine, 1, 0);
@@ -402,6 +407,11 @@ static void pc_init_isa(MachineState *machine)
     has_pci_info = false;
     has_acpi_build = false;
     smbios_defaults = false;
+    gigabyte_align = false;
+    smbios_legacy_mode = true;
+    has_reserved_memory = false;
+    option_rom_has_mr = true;
+    rom_file_has_mr = false;
     if (!machine->cpu_model) {
         machine->cpu_model = "486";
     }