[SUPPORT] Add the ok6410 board support according to the mini6410 and smdk6410.
[DETAIL]  Add the mach-ok6410.c, modify the Kconfig, Makefile, mach-types and s3c6410_defconfig.
          Modify the Makefile.lib to support make uImage for the uboot start.
[TEST]    Make uImage,then use the uboot start the uImage.The uboot can start the uImage normal.
[UART] Modify the uart initialize display message "S3C6400" to "S3C6410".
[TEST] Make uImage, then uboot start uImae by tftp mode, look the uart init message.
[NAND]   Resolve the nand initialize failure bug, the kernel can mount the nfs filesystem.
[DETAIL] Modify the nand pagesize, erasesize, params. Select the dm9000 net devices.
[TEST]   Make uImage, the nand init is ok, and the kernel can mount the nfs fs.