[U-Boot] OMAP3: am3517_evm: Add BCH8 ECC and UBIFS NAND support

This patch series updates NAND support for the LogicPD AM3517 EVM/EXP development boards and their corresponding System On Modules.

OMAP3: am3517_evm: Use BCH8 ECC for NAND OMAP3: am3517_evm: Replace JFFS2 with UBI/UBIFS on NAND OMAP3: am3517_evm: Misc. comment and option cleanup