global: Correct extern K_THREAD_STACK_DEFINE usage

This commit corrects all `extern K_THREAD_STACK_DEFINE` macro usages
to use the `K_THREAD_STACK_DECLARE` macro instead.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

arch/arm/core/aarch32/mpu/arm_core_mpu.c

@@ -46,7 +46,7 @@ LOG_MODULE_REGISTER(mpu);
 		_MPU_DYNAMIC_REGIONS_AREA_START)
 
 #if !defined(CONFIG_MULTITHREADING) && defined(CONFIG_MPU_STACK_GUARD)
-extern K_THREAD_STACK_DEFINE(z_main_stack, CONFIG_MAIN_STACK_SIZE);
+K_THREAD_STACK_DECLARE(z_main_stack, CONFIG_MAIN_STACK_SIZE);
 #endif
 
 #if defined(CONFIG_FPU) && defined(CONFIG_FPU_SHARING) \

arch/arm/core/aarch32/thread.c

@@ -38,7 +38,7 @@
 #endif
 
 #if !defined(CONFIG_MULTITHREADING) && defined(CONFIG_CPU_CORTEX_M)
-extern K_THREAD_STACK_DEFINE(z_main_stack, CONFIG_MAIN_STACK_SIZE);
+K_THREAD_STACK_DECLARE(z_main_stack, CONFIG_MAIN_STACK_SIZE);
 #endif
 
 /* An initial context, to be "restored" by z_arm_pendsv(), is put at the other

tests/arch/arm/arm_no_multithreading/src/main.c

@@ -23,7 +23,7 @@
 #define FPSCR_MASK		(0xffffffffU)
 #endif
 
-extern K_THREAD_STACK_DEFINE(z_main_stack, CONFIG_MAIN_STACK_SIZE);
+K_THREAD_STACK_DECLARE(z_main_stack, CONFIG_MAIN_STACK_SIZE);
 
 static volatile int test_flag;
 static unsigned int expected_reason;