arm: uaccess: Remove memcpy_page_flushcache()

Commit 21b56c847753 ("iov_iter: get rid of separate bvec and xarray
callbacks") removed the calls to memcpy_page_flushcache().

Remove the unnecessary memcpy_page_flushcache() call.

Cc: Al Viro <[e-mail]>
Cc: "Dan Williams" <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: [e-mail]
Signed-off-by: Ira Weiny <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Will Deacon <[e-mail]>

arch/arm64/include/asm/uaccess.h

···
 extern __must_check long strnlen_user(const char __user *str, long n);
 
 #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
-struct page;
-void memcpy_page_flushcache(char *to, struct page *page, size_t offset, size_t len);
 extern unsigned long __must_check __copy_user_flushcache(void *to, const void __user *from, unsigned long n);
 
 static inline int __copy_from_user_flushcache(void *dst, const void __user *src, unsigned size)

arch/arm64/lib/uaccess_flushcache.c

···
 }
 EXPORT_SYMBOL_GPL(memcpy_flushcache);
 
-void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
-			    size_t len)
-{
-	memcpy_flushcache(to, page_address(page) + offset, len);
-}
-
 unsigned long __copy_user_flushcache(void *to, const void __user *from,
 				     unsigned long n)
 {