Few device fixes for omaps

Here's a collection of minor fixes for annoying usability issues
people have noticed using various devices.

There are two regression fixes:

- A regression fix for omap5 usb3 dual role mode

- A regression fix to ams-delta audio being muted permanently

And two one-liners:

- Fix polarity for am335x-pdu001 SD card detection

- Fix non-working omap4-sdp Ethernet startup for rebind

It would be nice to get these merged during the -rc cycle if
possible. Naturally these can all wait for the merge window too
if we start running out of time.
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