Add necessary clock for rpmsg audio. These clocks are needed
by M4 image

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Peng Zhang <peng.zhang_8@nxp.com>
(cherry-picked from commit 0d11ab36510677aed5481c65fbd2f4a9264c75bb)