Remove emberAfStackDown. (#25296)

This is unused and does nothing.

Fixes #1940

src/app/util/generic-callback-stubs.cpp

@@ -55,13 +55,6 @@ emberAfExternalAttributeWriteCallback(EndpointId endpoint, ClusterId clusterId,
     return EMBER_ZCL_STATUS_FAILURE;
 }
 
-void __attribute__((weak)) emberAfRegistrationAbortCallback() {}
-
-bool __attribute__((weak)) emberAfStartMoveCallback()
-{
-    return false;
-}
-
 chip::Protocols::InteractionModel::Status __attribute__((weak))
 MatterPreAttributeChangeCallback(const chip::app::ConcreteAttributePath & attributePath, uint8_t type, uint16_t size,
                                  uint8_t * value)

src/app/util/generic-callbacks.h

@@ -159,22 +159,6 @@ EmberAfStatus emberAfExternalAttributeReadCallback(chip::EndpointId endpoint, ch
 EmberAfStatus emberAfExternalAttributeWriteCallback(chip::EndpointId endpoint, chip::ClusterId clusterId,
                                                     const EmberAfAttributeMetadata * attributeMetadata, uint8_t * buffer);
 
-/** @brief Registration Abort
- *
- * This callback is called when the device should abort the registration
- * process.
- *
- */
-void emberAfRegistrationAbortCallback();
-
-/** @brief Start Move
- *
- * This function is called to initiate the process for a device to move (rejoin)
- * to a new parent.
- *
- */
-bool emberAfStartMoveCallback();
-
 /** @brief Pre Attribute Change
  *
  * This function is called by the application framework before it changes an

src/app/util/util.cpp

@@ -138,16 +138,6 @@ void MatterProxyDiscoveryPluginServerInitCallback() {}
 void MatterProxyConfigurationPluginServerInitCallback() {}
 void MatterFanControlPluginServerInitCallback() {}
 
-// ****************************************
-// This function is called by the application when the stack goes down,
-// such as after a leave network. This allows zcl utils to clear state
-// that should not be kept when changing networks
-// ****************************************
-void emberAfStackDown()
-{
-    emberAfRegistrationAbortCallback();
-}
-
 // ****************************************
 // Print out information about each cluster
 // ****************************************

src/app/util/util.h

@@ -35,7 +35,6 @@ extern const EmberAfClusterName zclClusterNames[];
 
 void emberAfInit();
 uint16_t emberAfFindClusterNameIndex(chip::ClusterId cluster);
-void emberAfStackDown(void);
 
 /**
  * Retrieves the difference between the two passed values.