[ALSA] Fix struct alignment on PPC64

IOCTL32 emulation
Fixed the struct size mismatch (due to alignment) of
snd_ctl_elem_value_t for PPC64.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/ioctl32/ioctl32.c

@@ -220,6 +220,9 @@ struct sndrv_ctl_elem_value32 {
 	unsigned int indirect;	/* bit-field causes misalignment */
         union {
 		s32 integer[128];	/* integer and boolean need conversion */
+#ifdef CONFIG_PPC64
+		s64 integer64[64];	/* for alignment */
+#endif
 		unsigned char data[512];	/* others should be compatible */
         } value;
         unsigned char reserved[128];	/* not used */