ASoC: qcom: q6asm: add q6asm_get_hw_pointer

ASoC: qcom: q6asm: add q6asm_get_hw_pointer

Currently q6asm-dai is performing an extra layer of calculation on the hw_ptr,
which is always prone to errors and redundant.

q6asm already has tokens to indentify the pointer pointers which an be
used to get the hw_ptr and this is more accurate then doing the
artificial calculation at upper layers.

Add helper function q6asm_get_hw_pointer() to get this hw_ptr.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Tested-by: Alexey Klimov <alexey.klimov@linaro.org> # RB5, RB3
Link: https://patch.msgid.link/20251023102444.88158-8-srinivas.kandagatla@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>