drivers: rk_nand: update nand flash drivers

1. support samsung 14nm 8GB NAND FLASH.
2. support ymtc 64L 32GB NAND FLASH.
3. support toshiba 15nm 8GB NAND FLASH.
4. disabled loader upgrade api.

Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
Change-Id: Ifa5b380412b3b8fa704803bff7cddc7388fb629a

Author: zhao0116