crypto: aegis128-neon - add header for internal prototypes

gcc warns if prototypes are only visible to the caller but
not the callee:

crypto/aegis128-neon-inner.c:134:6: warning: no previous prototype for 'crypto_aegis128_init_neon' [-Wmissing-prototypes]
crypto/aegis128-neon-inner.c:164:6: warning: no previous prototype for 'crypto_aegis128_update_neon' [-Wmissing-prototypes]
crypto/aegis128-neon-inner.c:221:6: warning: no previous prototype for 'crypto_aegis128_encrypt_chunk_neon' [-Wmissing-prototypes]
crypto/aegis128-neon-inner.c:270:6: warning: no previous prototype for 'crypto_aegis128_decrypt_chunk_neon' [-Wmissing-prototypes]
crypto/aegis128-neon-inner.c:316:5: warning: no previous prototype for 'crypto_aegis128_final_neon' [-Wmissing-prototypes]

The prototypes cannot be in the regular aegis.h, as the inner neon code
cannot include normal kernel headers. Instead add a new header just for
the functions provided by this file.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/aegis-neon.h

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef _AEGIS_NEON_H
+#define _AEGIS_NEON_H
+
+void crypto_aegis128_init_neon(void *state, const void *key, const void *iv);
+void crypto_aegis128_update_neon(void *state, const void *msg);
+void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
+					unsigned int size);
+void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
+					unsigned int size);
+int crypto_aegis128_final_neon(void *state, void *tag_xor,
+			       unsigned int assoclen,
+			       unsigned int cryptlen,
+			       unsigned int authsize);
+
+#endif

crypto/aegis128-neon-inner.c

@@ -16,6 +16,7 @@
 #define AEGIS_BLOCK_SIZE	16
 
 #include <stddef.h>
+#include "aegis-neon.h"
 
 extern int aegis128_have_aes_insn;
 

crypto/aegis128-neon.c

@@ -7,17 +7,7 @@
 #include <asm/neon.h>
 
 #include "aegis.h"
-
+#include "aegis-neon.h"
-void crypto_aegis128_init_neon(void *state, const void *key, const void *iv);
-void crypto_aegis128_update_neon(void *state, const void *msg);
-void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
-					unsigned int size);
-void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
-					unsigned int size);
-int crypto_aegis128_final_neon(void *state, void *tag_xor,
-			       unsigned int assoclen,
-			       unsigned int cryptlen,
-			       unsigned int authsize);
 
 int aegis128_have_aes_insn __ro_after_init;