fixes-for-v3.7-rc4

usb: fixes for v3.7-rc4

We're reverting MUSB Mode 1 DMA patch which caused many regressions. Meanwhile
Roger is cooking a better version of that patch, which will hopefully be ready
for v3.8 merge window.

We also fix an undeclared error in ux5000_remove() and another build error
when we try to build USB_MUSB_OMAP2PLUS as a module.
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