linker: move all linker headers to include/linker

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/kernel/compiler_stack_protect.c b/kernel/compiler_stack_protect.c
index a55632d..7ed30bb 100644
--- a/kernel/compiler_stack_protect.c
+++ b/kernel/compiler_stack_protect.c
@@ -20,7 +20,7 @@
 
 #include <kernel_structs.h>
 #include <toolchain.h>
-#include <sections.h>
+#include <linker/sections.h>
 #include <kernel.h>
 
 /**