soc: swr-mstr: check swrm->state in swr_runtime_suepend

in swrm_runtime_suspend, current_state is not updated and
causes audio_core_vote is not disabled. Update to check
swrm->state to resolve this issue.

Change-Id: I2c5be360fe5ddd964d7bc45696e254579aae5392
Signed-off-by: Meng Wang <mengw@codeaurora.org>