apf: Integrate multiple dmabuf support.

Store type of buffer for each DMA BD in dma submit and
check that in dma_wait instead of checking a global
flag.

NOTE: It is a workaround for xilinx-v2015.2.01 tag and will
be re-implemented in next SDSOC release(using CF_FLAGs).

Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Yogesh Chobe <yogeshc@xilinx.com>
Tested-by: Yogesh Chobe <yogeshc@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>