target/ppc: Use aesenc_SB_SR_AK

This implements the VCIPHERLAST instruction.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/ppc/int_helper.c

@@ -25,6 +25,7 @@
 #include "qemu/log.h"
 #include "exec/helper-proto.h"
 #include "crypto/aes.h"
+#include "crypto/aes-round.h"
 #include "fpu/softfloat.h"
 #include "qapi/error.h"
 #include "qemu/guest-random.h"
@@ -2947,13 +2948,7 @@ void helper_vcipher(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b)
 
 void helper_vcipherlast(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b)
 {
-    ppc_avr_t result;
-    int i;
-
-    VECTOR_FOR_INORDER_I(i, u8) {
-        result.VsrB(i) = b->VsrB(i) ^ (AES_sbox[a->VsrB(AES_shifts[i])]);
-    }
-    *r = result;
+    aesenc_SB_SR_AK((AESState *)r, (AESState *)a, (AESState *)b, true);
 }
 
 void helper_vncipher(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b)