drivers: soc: qcom: Initialize blocking notifier as per lockdep

Initialize fsa4480 blocking notifier chain head as per the
lockdep annotation to fix the warnings with LOCKDEP enabled.

Change-Id: I771b0d9e1a9c1d28cd9b5bee2d7695ff95178db9
Signed-off-by: Puneeth Prabhu <quic_pprabh@quicinc.com>