arm-soc: samsung dma changes

Some platforms are not yet converted to use the dmaengine framework,
including some of the samsung SoCs. In the meantime, we treat this
as platform code and merge the patches through the arm-soc tree.
Merge branch 'next/devel-dma-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/dma

From Kukjin Kim <kgene.kim@samsung.com>:

Here is updating DMA common operation for Samsung SoCs.

Since some DMA client driver such as spi needs to change the configuration
after dma_request() so this branch adds dma_config() can configure DMA
transmit option which is included in dma_request() after that.

Note, according to the changes, needs to update spi and ASoC drivers
for Samsung SoCs and only got the ack from Mark Brown not Grant Likely
and as I know, he is busy for moving. But I think, the spi change has
no problem and it is simple.

* 'next/devel-dma-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
  ARM: SAMSUNG: Fix compiler warning in dma-ops.c file
  ASoC: follow the updated samsung DMA common operations
  spi/s3c64xx: Add the use of DMA config operation
  ARM: SAMSUNG: Add config() function in DMA common operations

Signed-off-by: Arnd Bergmann <arnd@arndb.de>