mac_newworld: Turn CORE99_VIA_CONFIG defines into an enum

This might allow the compiler to check values.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <f9da172e486c1f57f8542c7c3cb0223cffa89b1f.1666957578.git.balaton@eik.bme.hu>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

hw/ppc/mac_newworld.c

@@ -95,15 +95,17 @@ typedef struct Core99MachineState Core99MachineState;
 DECLARE_INSTANCE_CHECKER(Core99MachineState, CORE99_MACHINE,
                          TYPE_CORE99_MACHINE)
 
-#define CORE99_VIA_CONFIG_CUDA     0x0
-#define CORE99_VIA_CONFIG_PMU      0x1
-#define CORE99_VIA_CONFIG_PMU_ADB  0x2
+typedef enum {
+    CORE99_VIA_CONFIG_CUDA = 0,
+    CORE99_VIA_CONFIG_PMU,
+    CORE99_VIA_CONFIG_PMU_ADB
+} Core99ViaConfig;
 
 struct Core99MachineState {
     /*< private >*/
     MachineState parent;
 
-    uint8_t via_config;
+    Core99ViaConfig via_config;
 };
 
 static void fw_cfg_boot_set(void *opaque, const char *boot_device,