lib: peer_manager: refactor PM_SERVICE_CHANGED dependencies

If not using a GATT server, or using a server without a service changed
characteristic, this Kconfig option should be disabled to save code space.
Refactors this Kconfig option in order to represent this relationship
accordingly.

Signed-off-by: Mirko Covizzi <[email protected]>

Author: MirkoCovizzi

lib/peer_manager/Kconfig

@@ -42,6 +42,7 @@ config PM_FLASH_BUFFERS
 
 config PM_SERVICE_CHANGED
 	bool "Enable/disable the service changed management for GATT server in Peer Manager."
+	depends on NRF_SDH_BLE_SERVICE_CHANGED
 	default y
 	help
 	  Enable/disable the service changed management for GATT server in Peer Manager.

lib/peer_manager/modules/gatt_cache_manager.c

@@ -127,15 +127,6 @@ static int m_flag_car_handle_queried;
  */
 static int m_flag_car_value_queried;
 
-#ifdef CONFIG_PM_SERVICE_CHANGED
-BUILD_ASSERT(IS_ENABLED(CONFIG_PM_SERVICE_CHANGED) ||
-	     !IS_ENABLED(CONFIG_NRF_SDH_BLE_SERVICE_CHANGED),
-	"CONFIG_PM_SERVICE_CHANGED should be enabled "
-	"if NRF_SDH_BLE_SERVICE_CHANGED is enabled.");
-#else
-#define CONFIG_PM_SERVICE_CHANGED 1
-#endif
-
 /**
  * @brief Function for resetting the module variable(s) of the GSCM module.
  *