dmaengine: constify of_device_id array

of_device_id is always used as const.
(See driver.of_match_table and open firmware functions)

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --cc drivers/dma/bestcomm/bestcomm.c
Simple merge

diff --cc drivers/dma/k3dma.c
Simple merge

diff --cc drivers/dma/mmp_pdma.c
Simple merge

diff --cc drivers/dma/mmp_tdma.c
Simple merge

diff --cc drivers/dma/mpc512x_dma.c
Simple merge

diff --cc drivers/dma/mv_xor.c
Simple merge

diff --cc drivers/dma/sirf-dma.c
Simple merge

diff --cc drivers/dma/sun6i-dma.c
Simple merge