arm64: mm: Remove unused declaration early_io_map()

Commit bf4b558 ("arm64: add early_ioremap support") removed the
implementation but leave declaration.

Signed-off-by: Yue Haibing <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: Yue Haibing

arch/arm64/include/asm/mmu.h

@@ -63,7 +63,6 @@ static inline bool arm64_kernel_unmapped_at_el0(void)
 extern void arm64_memblock_init(void);
 extern void paging_init(void);
 extern void bootmem_init(void);
-extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
 extern void create_mapping_noalloc(phys_addr_t phys, unsigned long virt,
 				   phys_addr_t size, pgprot_t prot);
 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,