i82378: Remove bogus MMIO coalescing

This MMIO area is an entry gate to legacy PC ISA devices, addressed via
PIO over there. Quite a few of the PIO ports have side effects on access
like starting/stopping timers that must be executed properly ordered
/wrt the CPU. So we have to remove the coalescing mark.
Acked-by: NHervé Poussineau <hpoussin@reactos.org>
Acked-by: NAndreas Färber <andreas.faerber@web.de>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit 0ec64507)
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>

hw/i82378.c

@@ -225,7 +225,6 @@ static int pci_i82378_init(PCIDevice *dev)
     pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->io);
 
     memory_region_init_io(&s->mem, &i82378_mem_ops, s, "i82378-mem", 0x01000000);
-    memory_region_set_coalescing(&s->mem);
     pci_register_bar(dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->mem);
 
     /* Make I/O address read only */