i.MX: esdhc: fix imx-esdhc driver for non-OF boards
Commit 39f7a7ee8b68 ("i.MX: esdhc: Do not rely on CPU type for quirks")
made imx-esdhc dependent on OF and broke probing for all non-OF boards.
Since newer platforms like mx6 and vf610 are restricted to OF, the non-OF
probing only needs to distinguish mx5 vs earlier SoC.
Signed-off-by: Alexander Kurz <akurz@blala.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>