ASoC: qcom: topology: Constify pointed ar control structs

ASoC: qcom: topology: Constify pointed ar control structs

audioreach_route_load() does not modify the pointed 'struct
audioreach_module' and functions for connecting subgraphs do not change
pointed 'struct snd_ar_control'.  Constify the pointers for
self-explanatory code (pointed memory is not modified by the function)
and a bit safer code.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20251219-b4-container-of-const-asoc-qcom-v2-2-05fd2ecc06fe@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>