PPC: Drop initial ESCC mapping

We are mapping ESCC to a static (incorrect) address on machine init. This
overlaps with our vram, rendering the screen barely usable.

Since openBIOS is clever enough to map ESCC to where it needs to be, we can
just drop that invalid map and everyone's happy.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

hw/ppc_newworld.c

@@ -325,7 +325,7 @@ static void ppc_core99_init (ram_addr_t ram_size,
     /* init basic PC hardware */
     pci_vga_init(pci_bus);
 
-    escc_mem = escc_init(0x80013000, pic[0x25], pic[0x24],
+    escc_mem = escc_init(0, pic[0x25], pic[0x24],
                          serial_hds[0], serial_hds[1], ESCC_CLOCK, 4);
     memory_region_init_alias(escc_bar, "escc-bar",
                              escc_mem, 0, memory_region_size(escc_mem));

hw/ppc_oldworld.c

@@ -237,7 +237,7 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
                                get_system_io());
     pci_vga_init(pci_bus);
 
-    escc_mem = escc_init(0x80013000, pic[0x0f], pic[0x10], serial_hds[0],
+    escc_mem = escc_init(0, pic[0x0f], pic[0x10], serial_hds[0],
                                serial_hds[1], ESCC_CLOCK, 4);
     memory_region_init_alias(escc_bar, "escc-bar",
                              escc_mem, 0, memory_region_size(escc_mem));