crypto: arm/sha512-neon - Fix clang function cast warnings

Instead of casting the function which upsets clang for some reason,
change the assembly function siganture instead.

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202304081828.zjGcFUyE-lkp@intel.com/
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/arm/crypto/sha512-neon-glue.c

@@ -20,8 +20,8 @@
 MODULE_ALIAS_CRYPTO("sha384-neon");
 MODULE_ALIAS_CRYPTO("sha512-neon");
 
-asmlinkage void sha512_block_data_order_neon(u64 *state, u8 const *src,
-					     int blocks);
+asmlinkage void sha512_block_data_order_neon(struct sha512_state *state,
+					     const u8 *src, int blocks);
 
 static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
 			      unsigned int len)
@@ -33,8 +33,7 @@ static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
 		return sha512_arm_update(desc, data, len);
 
 	kernel_neon_begin();
-	sha512_base_do_update(desc, data, len,
-		(sha512_block_fn *)sha512_block_data_order_neon);
+	sha512_base_do_update(desc, data, len, sha512_block_data_order_neon);
 	kernel_neon_end();
 
 	return 0;
@@ -49,9 +48,8 @@ static int sha512_neon_finup(struct shash_desc *desc, const u8 *data,
 	kernel_neon_begin();
 	if (len)
 		sha512_base_do_update(desc, data, len,
-			(sha512_block_fn *)sha512_block_data_order_neon);
-	sha512_base_do_finalize(desc,
-		(sha512_block_fn *)sha512_block_data_order_neon);
+				      sha512_block_data_order_neon);
+	sha512_base_do_finalize(desc, sha512_block_data_order_neon);
 	kernel_neon_end();
 
 	return sha512_base_finish(desc, out);