MLK-11326 dma: mxs-dma: remove the runtime pm dummy code
Currently, the dma engine driver don't support runtime pm,
and it is not necessary to support the feature since it support
slave sg and cyclic mode, and clock enable/disable during dma
chans allocate and release.
The patch remove the runtime pm dummy code.
Signed-off-by:
Fugang Duan <B38611@freescale.com>
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