signal-aop is an redundant property and is not being used in pas
driver and used only in qcom_spss driver however, it is an redundant
property. Drop this property and let qcom_spss manage does necessary
change to live without it.
Change-Id: If7016f281c753a38f9f1c4b35238de5a96db4c89
Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>