soc: qcom: Propagate separate error code for PDR disabled

In case of user PD restart requests from clients, return a separate error
code if PDR is disabled on subsystem. This is so that clients can
distinguish it from other error cases and take appropriate action.

CRs-Fixed: 2011758
Change-Id: Ifac7779455a3984de97a4e3e2f33bd74c5148cab
Signed-off-by: Puja Gupta <pujag@codeaurora.org>