[nrf toup][nrfconnect] Introduced Kconfig to configure CHIP stack size

There is not Kconfig that would allow to set the CHIP task size,
what is not convenient, as other stacks can be configured using
Kconfig.

Author: kkasperczyk-no

config/nrfconnect/chip-module/Kconfig

@@ -163,6 +163,13 @@ config CHIP_LOG_FILE_NAME
 config CHIP_MALLOC_SYS_HEAP
 	default y if !ARCH_POSIX
 
+config CHIP_TASK_STACK_SIZE
+	int "The CHIP (Matter) thread stack size"
+	default 10240 if LTO
+	default 6144
+	help
+	  Configures the stack size available for the CHIP (Matter) thread.
+
 config CHIP_FACTORY_DATA
 	bool "Factory data provider"
 	select ZCBOR

src/platform/nrfconnect/CHIPDevicePlatformConfig.h

@@ -175,11 +175,7 @@
 #endif // CHIP_DEVICE_CONFIG_CHIP_TASK_PRIORITY
 
 #ifndef CHIP_DEVICE_CONFIG_CHIP_TASK_STACK_SIZE
-#if defined(CONFIG_LTO)
-#define CHIP_DEVICE_CONFIG_CHIP_TASK_STACK_SIZE 10240
-#else
-#define CHIP_DEVICE_CONFIG_CHIP_TASK_STACK_SIZE 6144
-#endif // CONFIG_LTO
+#define CHIP_DEVICE_CONFIG_CHIP_TASK_STACK_SIZE CONFIG_CHIP_TASK_STACK_SIZE
 #endif // CHIP_DEVICE_CONFIG_CHIP_TASK_STACK_SIZE
 
 #define CHIP_DEVICE_CONFIG_MAX_EVENT_QUEUE_SIZE 64