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 <root@stephanos.io>
1 file changed