mtd: nand: use reworked NAND controller driver with Marvell EBU SoCs

Choose to compile and embed marvell_nand.c as NAND controller driver
instead of the legacy pxa3xx_nand.c for platforms with Marvell EBU
SoCs.

Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>