Cleanup: Prepare XR code for sorted headers

intern/ghost/intern/GHOST_XrContext.h

@@ -23,6 +23,9 @@
 
 #include <memory>
 #include <vector>
+
+#include "GHOST_Xr_intern.h"
+
 #include "GHOST_IXrContext.h"
 
 struct OpenXRInstanceData;

intern/ghost/intern/GHOST_XrSession.h

@@ -24,6 +24,8 @@
 #include <map>
 #include <memory>
 
+#include "GHOST_Xr_intern.h"
+
 class GHOST_XrContext;
 class GHOST_XrSwapchain;
 struct OpenXRSessionData;