arm64: Call swiotlb_init() instead of swiotlb_init_with_default_size()

Following commit 74838b7 (swiotlb: add the late swiotlb initialization
function with iotlb memory) the swiotlb_init_with_default_size() is a
static function. This patch changes the arm64 code to call
swiotlb_init() instead and use the default size of 64MB. It is assumed
that AArch64 platforms have enough RAM to afford the pre-allocated
swiotlb memory. It also removes the #ifdef around this call since
CONFIG_SWIOTLB is always enabled.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 5f719ba..efbf7df 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -301,10 +301,7 @@
 	unsigned long reserved_pages, free_pages;
 	struct memblock_region *reg;
 
-#if CONFIG_SWIOTLB
-	extern void __init arm64_swiotlb_init(size_t max_size);
-	arm64_swiotlb_init(max_pfn << (PAGE_SHIFT - 1));
-#endif
+	arm64_swiotlb_init();
 
 	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;