crypto: vmx - Fix warning on p8_ghash_alg

The compiler complains that p8_ghash_alg isn't declared which is
because the header file aesp8-ppc.h isn't included in ghash.c.
This patch fixes the warning.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/vmx/ghash.c

@@ -23,6 +23,7 @@
 #include <crypto/internal/hash.h>
 #include <crypto/internal/simd.h>
 #include <crypto/b128ops.h>
+#include "aesp8-ppc.h"
 
 void gcm_init_p8(u128 htable[16], const u64 Xi[2]);
 void gcm_gmult_p8(u64 Xi[2], const u128 htable[16]);