[PATCH v3 0/3] mt7621-mmc driver correctness fixes

This series improves up the patches that needed more work from v2 I sent
a couple days ago.  BUG_ON()s have been removed.

Let me know if you don't want the 'Remove obsolete Kconfig flags' patch I sent
in the previous series; I didn't see any mail about it.

Thanks!
George