Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>

Instead of having a platform device defined in a devices.c and register
it in the machine file allocate it dynamically.  This reduces the size
of needed memory as the new function is discarded after init and only
the existing devices are created.
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>

This should be a globally available function, see

	http://thread.gmane.org/gmane.linux.kernel/998881/focus=998882

Until this hits mainline create a similar function available for imx
platforms only.
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>