driver: net: fm: minor fix in DM ETH support

Bus callback functions for read/write/reset need to be set only for
DM_ETH, moving endif a bit lower.

Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
1 file changed