ASoC: qcom: q6apm: remove child devices when apm is removed

ASoC: qcom: q6apm: remove child devices when apm is removed

looks like q6apm driver does not remove the child driver q6apm-dai and
q6apm-bedais when the this driver is removed.

Fix this by depopulating them in remove callback.

With this change when the dsp is shutdown all the devices associated with
q6apm will now be removed.

Fixes: 5477518b8a0e ("ASoC: qdsp6: audioreach: add q6apm support")
Cc: Stable@vger.kernel.org
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Link: https://patch.msgid.link/20260402081118.348071-3-srinivas.kandagatla@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>