[ARM] msm: dma: various basic dma improvements and bugfixes
San:
- Propagate DM errors to the originator of the request.
- Implement msm_dmov_stop_cmd()
- Add return value to init code
- Modify msm_dmov_stop_cmd() to support ungraceful flushing
Arve:
- Disable datamover interrupt when not in use.
We turn off the interrrupt to allow power collapse from idle.
Signed-off-by: San Mehat <san@android.com>
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Brian Swetland <swetland@google.com>
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