Remove unimplemented power button and sd card eject callbacks

Author: fincs

include/nds/interrupts.h

@@ -80,16 +80,6 @@ enum IME_VALUE {
 extern "C" {
 #endif
 
-/*! \fn  VoidFn setPowerButtonCB(VoidFn CB);
-	\brief set callback for DSi Powerbutton press
-
-	\param CB
-		function to call when power button pressed
-	\return
-		the previously set callback
-*/
-VoidFn setPowerButtonCB(VoidFn CB);
-
 static inline int enterCriticalSection(void) {
 	return irqLock();
 }

include/nds/system.h

@@ -168,7 +168,6 @@ typedef struct sysVectors_t {
 #define SystemVectors __excpt_vectors
 
 extern sysVectors __excpt_vectors;
-void setSDcallback(void(*callback)(int));
 
 /*!
 	\brief Sets the ARM9 clock speed, only possible in DSi mode

source/arm9/system.c

@@ -37,14 +37,6 @@ distribution.
 //todo document
 //
 
-static void(*SDcallback)(int)=NULL;
-
-//---------------------------------------------------------------------------------
-void setSDcallback(void(*callback)(int)) {
-//---------------------------------------------------------------------------------
-	SDcallback = callback;
-}
-
 //---------------------------------------------------------------------------------
 void powerOn(int bits) {
 //---------------------------------------------------------------------------------