Reduce dependencies on global.h (10) (#2490)

* reduce z64.h size

* fix z_cheap_proc.inc.c

* ,bss

* remove temp delcaration

include/sys_debug_controller.h

@@ -0,0 +1,13 @@
+#ifndef SYS_DEBUG_CONTROLLER_H
+#define SYS_DEBUG_CONTROLLER_H
+
+#include "ultra64/ultratypes.h"
+
+#if DEBUG_FEATURES
+extern u32 gIsCtrlr2Valid;
+
+void func_800D31F0(void);
+void func_800D3210(void);
+#endif
+
+#endif