staging: fsl-dpaa2/ethsw: enable switch ports only on dev_open

staging: fsl-dpaa2/ethsw: enable switch ports only on dev_open

At probe time, only the DPSW object should be enabled without the
associated ports, which will get enabled on dev_open. Remove the
ethsw_open() and ethsw_stop() functions and replace them only with
dpsw_enable()/_disable().

Reported-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/1565700187-16048-3-git-send-email-ioana.ciornei@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>