driver: net: fsl-mc: fsl_mc_ldpaa_exit exit earlier if dpl applied

In fsl_mc_ldpaa_exit(), in case of mc is booted and dpl is applied,
it should return earlier without executing dpbp_exit().

Signed-off-by: Santan Kumar <santan.kumar@nxp.com>
Acked-by: Priyanka Jain <priyanka.jain@nxp.com>
Acked-by: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>