hw/arm: Mark the "fsl,imx25" device with user_creatable = false

QEMU currently crashes when the user tries to instantiate the fsl,imx25
device manually:

$ aarch64-softmmu/qemu-system-aarch64 -S -M imx25-pdk -device fsl,,imx25
**
ERROR:/home/thuth/devel/qemu/tcg/tcg.c:538:tcg_register_thread:
 assertion failed: (n < max_cpus)

The imx25-pdk board (which is the one that uses this CPU type) only
supports one CPU, and the realize function of the "fsl,imx25" device
also uses serial_hds[] directly, so this device clearly can not be
instantiated twice and thus we should mark it with user_creatable = 0.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-id: 1509519537-6964-3-git-send-email-thuth@redhat.com
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/fsl-imx25.c

@@ -288,8 +288,12 @@ static void fsl_imx25_class_init(ObjectClass *oc, void *data)
     DeviceClass *dc = DEVICE_CLASS(oc);
 
     dc->realize = fsl_imx25_realize;
-
     dc->desc = "i.MX25 SOC";
+    /*
+     * Reason: uses serial_hds in realize and the imx25 board does not
+     * support multiple CPUs
+     */
+    dc->user_creatable = false;
 }
 
 static const TypeInfo fsl_imx25_type_info = {