[FS#956] lantiq: Add TFTP PUT support to U-Boot

[LEDE Bugs]

The following task is now closed:

FS#956 - lantiq: Add TFTP PUT support to U-Boot
User who did this - Mathias Kresin (mkresin)

Reason for closing: Invalid report
Additional comments about closing: Please follow https://lede-project.org/submitting-patches to submit your patch.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=956