kernel: Migrate to K_KERNEL_PINNED_STACK_ARRAY_DECLARE

This commit updates all deprecated `K_KERNEL_PINNED_STACK_ARRAY_EXTERN`
macro usages to use the `K_KERNEL_PINNED_STACK_ARRAY_DECLARE` macro
instead.

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

Author: stephanosio

kernel/include/kernel_internal.h

@@ -156,8 +156,8 @@ extern struct k_thread z_main_thread;
 #ifdef CONFIG_MULTITHREADING
 extern struct k_thread z_idle_threads[CONFIG_MP_NUM_CPUS];
 #endif
-K_KERNEL_PINNED_STACK_ARRAY_EXTERN(z_interrupt_stacks, CONFIG_MP_NUM_CPUS,
-				   CONFIG_ISR_STACK_SIZE);
+K_KERNEL_PINNED_STACK_ARRAY_DECLARE(z_interrupt_stacks, CONFIG_MP_NUM_CPUS,
+				    CONFIG_ISR_STACK_SIZE);
 
 #ifdef CONFIG_GEN_PRIV_STACKS
 extern uint8_t *z_priv_stack_find(k_thread_stack_t *stack);