[FS#1096] usb mass storage : /dev/sda1 doesn't appear

[LEDE Bugs]

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

User who did this - ctrath (ctrath) 

Attached to Project - LEDE Project
Summary - usb mass storage : /dev/sda1 doesn't appear
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - I have an external USB 1.1 drive, which works with other devices, that doesn't appear to come up as a device in lede.

The device appears with lsusb -t:
```
root at LEDE:/dev# lsusb -t                                                                                                       
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ohci-platform/2p, 12M                                                         
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-platform/2p, 480M                                                        
    |__ Port 1: Dev 5, If 0, Class=Mass Storage, Driver=, 480M
```

However, /dev/sda1 isn't present.

I have a WNDRMACv2 and am using `LEDE Reboot 17.01.4 r3560-79f57e422d / LuCI lede-17.01 branch (git-17.290.79498-d3f0685)`

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1096