[FS#377] Add console support for Mikrotik RB433 and RB411 series devices

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - duvi (duvi) 

Attached to Project - LEDE Project
Summary - Add console support for Mikrotik RB433 and RB411 series devices
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - This patch adds support for serial console on Mikrotik RB433 and RB411 series devices.
Without this, it's impossible to debug a kernel failure.

One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=377