linker: move all linker headers to include/linker

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/drivers/interrupt_controller/loapic_intr.c b/drivers/interrupt_controller/loapic_intr.c
index 960353f..91a01d9 100644
--- a/drivers/interrupt_controller/loapic_intr.c
+++ b/drivers/interrupt_controller/loapic_intr.c
@@ -85,7 +85,7 @@
 
 #include "board.h"
 #include <toolchain.h>
-#include <sections.h>
+#include <linker/sections.h>
 #include <drivers/loapic.h> /* public API declarations */
 #include <init.h>
 #include <drivers/sysapic.h>