remoteproc: imx_dsp_rproc: Correct the comment style of copyright

Change '//' on copyright line to C style comments.

Reported-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1634092749-3707-1-git-send-email-shengjiu.wang@nxp.com


Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>