[Regression] powerpc/usb: fix issue of CPU halt when missing USB PHY clock

[Ben Collins]

Hello,

The patch that checks the CTRL_PHY_CLK_VALID bit is failing incorrectly on my system (P4080DS). If I revert it, my system goes back to working correctly, but as is, it fails and wont allow my USB to work properly.

I've tried adding a loop to poll this bit 10,000 times with a udelay(1) on each loop and it still fails, so it doesn't appear to be a timing issue.

Is this check valid for all systems?

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