Switch kbc to device_t kbd_device

src/include/86box/keyboard.h

@@ -39,8 +39,6 @@ typedef struct {
 #define RSHIFT_OFF       0x105
 
 /* KBC #define's */
-#define KBC_UNKNOWN 0x0000 /* As yet unknown keyboard */
-
 /* IBM-style controllers */
 #define KBC_IBM_PC_XT          0x0000 /* IBM PC/XT */
 #define KBC_IBM_PCJR           0x0001 /* IBM PCjr */

src/include/86box/machine.h

@@ -288,7 +288,11 @@ typedef struct _machine_ {
     const machine_memory_t ram;
     int                    ram_granularity;
     int                    nvrmask;
-    uint16_t               kbc;
+#ifdef EMU_DEVICE_H
+    const device_t *kbc_device;
+#else
+    void *kbc_device;
+#endif /* EMU_DEVICE_H */
     /* Bits:
         7-0	Set bits are forced set on P1 (no forced set = 0x00);
         15-8	Clear bits are forced clear on P1 (no foced clear = 0xff). */
@@ -324,6 +328,7 @@ extern char *machine_get_internal_name(void);
 extern int   machine_get_machine_from_internal_name(char *s);
 extern void  machine_init(void);
 #ifdef EMU_DEVICE_H
+extern const device_t *machine_get_kbc_device(int m);
 extern const device_t *machine_get_device(int m);
 extern const device_t *machine_get_vid_device(int m);
 extern const device_t *machine_get_snd_device(int m);