bus: fsl-mc: Convert to bus callbacks

With the eventual goal to drop .probe(), .remove() and .shutdown() from
struct device_driver, convert the fsl bus to use bus methods.

Other than a driver's shutdown callback the bus shutdown callback is
also called for unbound drivers. So check for the device being bound
before following the pointer to its driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/848fffe5c479d899c04a4c99ccb5f0128ccc942d.1764684327.git.u.kleine-koenig@baylibre.com
Link: https://lore.kernel.org/r/20251209115950.3382308-2-u.kleine-koenig@baylibre.com
[chleroy: squashed the two patches]
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>

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