arm: imx53-guf-vincell-lt: dts: do not specfiy fixed memory information ...

Setting a fixed memory size prevents from using the different board
variants with different memories equipped.

barebox is able to read RAM size informations from the imx53 RAM
controller and thus does not require this information passed via dts.

Signed-off-by: Enrico Jorns <ejo@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: vincell: move to DT probing ...

This enabled multi image support for the Garz&Fricke Vincell board. Also
it adds the Vincell-LT as a second image with a separate device tree.
Previously we used the same image on both the Vincell and the Vincell-LT
image since the differences are not that significant for barebox. Still
this was good for quite some confusion internally, so let's properly
introduce a second image.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>