drivers: rk_nand: fix update loader fail issue

patch for arm aarch32 and aarch64.

bug: The NAND driver will write data to the wrong address with
2K page size SLC NAND FLASH.

[   14.047987] IDBlockWriteData 100 100
[   14.074717] IDBlockWriteData 100 100 ret= 0
[   14.075091] IdBlockReadData 100 100
[   14.084396] IdBlockReadData 100 100 ret= 0
[   14.084777] write and check error:1 idb=1,offset=86,r=238,w=40238

Change-Id: I2d635d0939edb2b2674c37898d5afd668da2ae5a
Signed-off-by: Yifeng Zhao <zyf@rock-chips.com>

Author: zhao0116