dmaengine: Add support for BCM2835

Add support for DMA controller of BCM2835 as used in the Raspberry Pi.
Currently it only supports cyclic DMA.

Signed-off-by: Florian Meier <florian.meier@koalo.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --cc Documentation/devicetree/bindings/dma/bcm2835-dma.txt
Simple merge

diff --cc drivers/dma/Kconfig
Simple merge

diff --cc drivers/dma/Makefile
Simple merge

diff --cc drivers/dma/bcm2835-dma.c
Simple merge