soundwire: qcom: constify static struct qcom_swrm_data global variables

soundwire: qcom: constify static struct qcom_swrm_data global variables

The qcom_swrm_data structures is only required for setting soundwire
params, so make the qcom_swrm_data structure const to allow the compiler
to put it in read-only memory and avoid unintentional modifications.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Co-developed-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
Signed-off-by: Venkata Prasad Potturu <quic_potturu@quicinc.com>
Link: https://lore.kernel.org/r/1646224982-3361-3-git-send-email-quic_srivasam@quicinc.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>