ASoC: msm: fix in-tree compilation for RTAC

In-tree compilation for sound/soc/msm/qdsp6v2/rtac.c was hitting this
error:

sound/soc/msm/qdsp6v2/rtac.c:27:21: fatal error: q6voice.h: No such file
or directory
 #include <q6voice.h>

This was due to using <> instead of "" style include.

Change-Id: Ie96cc91bd29e44c55b9fb0cbc36e25786d6f8823
Signed-off-by: Kumar Gala <galak@codeaurora.org>