Instead of completing initialization via scan_bbt callback use
NAND self init to initialize the GPMI (MXS) NAND controller.
Suggested-by: Scott Wood <oss@buserror.net>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
In preparation to convert the driver to use NAND self init
provide a new minimal init for SPL builds. As a side effect
this also reduces size of SPL by about 4KiB.
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>