pc: rename machine types

Starting with release 1.4 we have a fully functional q35 machine type,
i.e. "qemu -M q35" JustWorks[tm].  Update machine type names to reflect
that:

  * pc-1.4 becomes pc-i440fx-1.4
  * q35-next becomes pc-q35-1.4

The pc-1.3 (+older) names are maintained for compatibility reasons.
For the same reason the "pc" and "q35" aliases are kept.  pc-piix-1.4
continues to be the default machine type, again for compatibility
reasons.

Also updated the description (shown by "qemu -M ?") with host bridge
name, south bridge name and chipset release year.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/pc_piix.c

@@ -282,10 +282,10 @@ static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
 }
 #endif
 
-static QEMUMachine pc_machine_v1_4 = {
-    .name = "pc-1.4",
+static QEMUMachine pc_i440fx_machine_v1_4 = {
+    .name = "pc-i440fx-1.4",
     .alias = "pc",
-    .desc = "Standard PC",
+    .desc = "Standard PC (i440FX + PIIX, 1996)",
     .init = pc_init_pci_1_3,
     .max_cpus = 255,
     .is_default = 1,
@@ -646,7 +646,7 @@ static QEMUMachine xenfv_machine = {
 
 static void pc_machine_init(void)
 {
-    qemu_register_machine(&pc_machine_v1_4);
+    qemu_register_machine(&pc_i440fx_machine_v1_4);
     qemu_register_machine(&pc_machine_v1_3);
     qemu_register_machine(&pc_machine_v1_2);
     qemu_register_machine(&pc_machine_v1_1);

hw/pc_q35.c

@@ -209,9 +209,9 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
 }
 
 static QEMUMachine pc_q35_machine = {
-    .name = "q35-next",
+    .name = "pc-q35-1.4",
     .alias = "q35",
-    .desc = "Q35 chipset PC",
+    .desc = "Standard PC (Q35 + ICH9, 2009)",
     .init = pc_q35_init,
     .max_cpus = 255,
 };