hw: Use new memory_region_init_{ram, rom, rom_device}() functions

Use the new functions memory_region_init_{ram,rom,rom_device}()
instead of manually calling the _nomigrate() version and then
vmstate_register_ram_global().

Patch automatically created using coccinelle script:
 spatch --in-place -sp_file scripts/coccinelle/memory-region-init-ram.cocci -dir hw

(As it turns out, there are no instances of the rom and
rom_device functions that are caught by this script.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1499438577-7674-8-git-send-email-peter.maydell@linaro.org
diff --git a/hw/display/tc6393xb.c b/hw/display/tc6393xb.c
index 762e370..74d10af 100644
--- a/hw/display/tc6393xb.c
+++ b/hw/display/tc6393xb.c
@@ -586,9 +586,8 @@
     memory_region_init_io(&s->iomem, NULL, &tc6393xb_ops, s, "tc6393xb", 0x10000);
     memory_region_add_subregion(sysmem, base, &s->iomem);
 
-    memory_region_init_ram_nomigrate(&s->vram, NULL, "tc6393xb.vram", 0x100000,
+    memory_region_init_ram(&s->vram, NULL, "tc6393xb.vram", 0x100000,
                            &error_fatal);
-    vmstate_register_ram_global(&s->vram);
     s->vram_ptr = memory_region_get_ram_ptr(&s->vram);
     memory_region_add_subregion(sysmem, base + 0x100000, &s->vram);
     s->scr_width = 480;