usb: fixes for v3.7-rc3

Here's a new set of fixes for v3.7-rc3. It's quite small, only
four patches.

There's one bug fix for the newly added musb-dsps glue layer where
we could be overflowing a buffer when creating the instance name.

NET2272 got a fix for a case where the lock would be left held
when exiting the IRQ handler with error in case of Spurious IRQs.

Renensas USBHS got a DMA stall fix which would cause transfers to
stall forever and a NULL pointer deref fix in case of pipe detach.
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