arm64: remove the unnecessary arm64_swiotlb_init()

The commit 3690951fc6d42f3a0903987677d0e592c49dd8db
(arm64: Use swiotlb late initialisation)
switches the DMA mapping code to swiotlb_tlb_late_init_with_default_size(), the arm64_swiotlb_init() will not used anymore, so remove this function.

---
 arch/arm64/mm/mm.h | 1 -
 1 file changed, 1 deletion(-)

index d519f4f..50c3351 100644
@@ -1,2 +1 @@
 extern void __init bootmem_init(void);
-extern void __init arm64_swiotlb_init(void);

1.8.0