ASoC: qdsp6v2: Add support of ULL and LL

Add support for Low latency pcm and Ultra low latency pcm in
legacy pcm driver. A flag, part of device tree is used to
differentiate low latency and ultra low latency.
Only one ULL stream can be be connected to one ULL COPP.
LL stream can be connected to LL or regular COPP.

Change-Id: I2663ccdb641acc4117d1c0e424a57ed942e78f40
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>