Remove the QDMA hooks from the Linux EDMA code.

No Linux code in the DaVinci GIT tree or the latest DVSDK code from
MV/TI needs QDMA, so it's just a needless mechanism cluttering this
code and complicating a merge to mainline.  QDMA likely deserves
a new programming interface anyway.

Saves about 1400 bytes of object code.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>