drm/xe: Drop xe_vm_assert_held() macro definition from xe_bo.h

It is already defined in xe_vm.h and shouldn't be duplicated.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240405113844.803-1-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/xe_bo.h

@@ -13,14 +13,6 @@
 #include "xe_vm_types.h"
 #include "xe_vm.h"
 
-/**
- * xe_vm_assert_held(vm) - Assert that the vm's reservation object is held.
- * @vm: The vm
- */
-#define xe_vm_assert_held(vm) dma_resv_assert_held(xe_vm_resv(vm))
-
-
-
 #define XE_DEFAULT_GTT_SIZE_MB          3072ULL /* 3GB by default */
 
 #define XE_BO_FLAG_USER		BIT(0)