macfb: use memory_region_init_ram() in macfb_common_realize() for the framebuffer

Currently macfb_common_realize() defines the framebuffer RAM memory region as
being non-migrateable but then immediately registers it for migration. Replace
memory_region_init_ram_nomigrate() with memory_region_init_ram() which is clearer
and does exactly the same thing.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20211007221253.29024-6-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

hw/display/macfb.c

@@ -367,11 +367,10 @@ static bool macfb_common_realize(DeviceState *dev, MacfbState *s, Error **errp)
     memory_region_init_io(&s->mem_ctrl, OBJECT(dev), &macfb_ctrl_ops, s,
                           "macfb-ctrl", 0x1000);
 
-    memory_region_init_ram_nomigrate(&s->mem_vram, OBJECT(dev), "macfb-vram",
-                                     MACFB_VRAM_SIZE, &error_abort);
+    memory_region_init_ram(&s->mem_vram, OBJECT(dev), "macfb-vram",
+                           MACFB_VRAM_SIZE, &error_abort);
     s->vram = memory_region_get_ram_ptr(&s->mem_vram);
     s->vram_bit_mask = MACFB_VRAM_SIZE - 1;
-    vmstate_register_ram(&s->mem_vram, dev);
     memory_region_set_coalescing(&s->mem_vram);
 
     return true;