Glamo hang during initialization

[Andy Green]

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Somebody in the thread at some point said:

|                 while (!glamofb_cmdq_empty(gfb))
|                         yield();
|
| Below is a stack trace. (jtag_use++;  /* ;-) */ )

Ha.

| Andy, does this ring any bells ?

I saw it when we were in .tw, I did not see it since I added this test
patch while I was there.  It doesn't truly fix anything but it works
around it evidently because I have hundreds of boots since with no stalls.

- -Andy
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