cam_enc_4xx: Set CONFIG_SYS_NAND_MAX_OOBFREE / CONFIG_SYS_NAND_MAX_ECCPOS

With the changes to make OOBFREE/ECCPOS configurable but default to
larger, we need to set these config options for the space savings they
provide.

Cc: Scott Wood <scottwood@freescale.com>
Cc: Heiko Schocher <hs@denx.de>
Signed-off-by: Tom Rini <trini@ti.com>