[FS#934] add SPI clock info

[LEDE Bugs]

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

User who did this - psyborg55 (psyborg55) 

Attached to Project - LEDE Project
Summary - add SPI clock info
Task Type - Feature Request
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - current clock info shows all clocks for ar71xx platform except SPI clock

Clocks: CPU:800.000MHz, DDR:600.000MHz, AHB:300.000MHz, Ref:25.000MHz

 
SPI clock would be quite useful to have displayed too as well as all of these clocks for ramips and other platforms that don't show much info on dmesg.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=934