ASoC: qcom: lpass-sc7180: Add maybe_unused tag for system PM ops

Add __maybe_unused tag for system PM ops suspend and resume.
This is required to fix allmodconfig compilation issue.

Fixes: a3a96e93 ("ASoC: qcom: lpass-sc7280: Add system suspend/resume PM ops")
Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Link: https://lore.kernel.org/r/1669726428-3140-1-git-send-email-quic_srivasam@quicinc.com


Signed-off-by: Mark Brown <broonie@kernel.org>