hw/arm/exynos: Use type define instead of hard-coded a9mpcore_priv string

Use a define for a9mpcore_priv device type name instead of hard-coded
string.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/exynos4210.c

@@ -26,6 +26,7 @@
 #include "qemu-common.h"
 #include "qemu/log.h"
 #include "cpu.h"
+#include "hw/cpu/a9mpcore.h"
 #include "hw/boards.h"
 #include "sysemu/sysemu.h"
 #include "hw/sysbus.h"
@@ -211,7 +212,7 @@ Exynos4210State *exynos4210_init(MemoryRegion *system_mem)
     }
 
     /* Private memory region and Internal GIC */
-    dev = qdev_create(NULL, "a9mpcore_priv");
+    dev = qdev_create(NULL, TYPE_A9MPCORE_PRIV);
     qdev_prop_set_uint32(dev, "num-cpu", EXYNOS4210_NCPUS);
     qdev_init_nofail(dev);
     busdev = SYS_BUS_DEVICE(dev);