ASoC: qcom: Constify GPR callback response data

ASoC: qcom: Constify GPR callback response data

GPR bus driver calls each GPR client callback with pointer to the GPR
response packet.  The callbacks are not suppose to modify that response
packet, so make it a pointer to const to document that expectation
explicitly.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Link: https://patch.msgid.link/20251130-asoc-apr-const-v1-3-d0833f3ed423@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>