LF-4484: remoteproc: imx-dsp-rproc: Avoid power on device after probe

With multiple power domain case, don't need to use flag
DL_FLAG_RPM_ACTIVE when device linking, otherwise the power
is always enabled after probe.

With DSP's case, the power may increase about 20% for whole system
when DSP is enabled wrongly.

Fixes: d2634e10 ("LF-4209-1: remoteproc: imx_dsp_rproc: add remoteproc driver for dsp")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Peng Zhang <peng.zhang_8@nxp.com>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>