Expose per arch headers.

Bug: 73013352

Test: Compiles.
Change-Id: Ic05660db7d7858a9857143ee5e58cdaddcf52a35
diff --git a/libunwindstack/ElfInterfaceArm.cpp b/libunwindstack/ElfInterfaceArm.cpp
index 616d1b1..dfb8e8f 100644
--- a/libunwindstack/ElfInterfaceArm.cpp
+++ b/libunwindstack/ElfInterfaceArm.cpp
@@ -17,12 +17,12 @@
 #include <elf.h>
 #include <stdint.h>
 
+#include <unwindstack/MachineArm.h>
 #include <unwindstack/Memory.h>
 #include <unwindstack/RegsArm.h>
 
 #include "ArmExidx.h"
 #include "ElfInterfaceArm.h"
-#include "MachineArm.h"
 
 namespace unwindstack {