[FS#146] wndr 3700v4 and 4300v1 couldn't effectively use 128 nand flash space

[LEDE Bugs]

The following task is now closed:

FS#146 - wndr 3700v4 and 4300v1 couldn't effectively use 128 nand flash space
User who did this - Piotr Dymacz (pepe2k)

Reason for closing: Won't implement
Additional comments about closing: The flash layout OpenWrt/LEDE uses on these devices follows the one used in vendor firmware.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=146