ASoC: qcom: qdsp6: add push/pull module support

Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com> says:

This patchset adds support for Push/Pull mode modules.
Push-pull mode uses dedicated shared-memory modules that allow the DSP
to access the PCM circular buffer directly. In addition to reducing
fragment queueing and ACK handling in the host driver,
This mode exposes a DSP-maintained position buffer that provides
fine-grained hardware pointer updates. Unlike the Read/Write Shared
Memory endpoitn modules, which are period based, where the reported
pointer advances only at period boundaries, where as push-pull mode
allows .pointer() to reflect sub-period progress, improving pointer
accuracy.
Also the driver now can queue buffers which are less than period size,
which makes tests like alsa_conformance_test happy.

Now the pointer update visibility is around 1ms, compared to min of
10ms with read/write shared memory endpoints.

Along with the circular buffer support, this patchset also adds
watermark event support to provide a period level event from dsp to
notify about period progress.

Tested this on T14s, Arduino VENTUNO-Q platforms.

Tplg related changes are available at:
https://github.com/Srinivas-Kandagatla/audioreach-topology/tree/push/pull

Link: https://patch.msgid.link/20260528185806.6316-1-srinivas.kandagatla@oss.qualcomm.com

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