soc: qcom: smp2p: Fix possible smp2p entry double free

In case of restore path there could be a chance that smp2p entry
duble freed or valid entry might be uninitialized. Also fix entry
deference after being freed by calling kfree().

Change-Id: I5dcb12e01972e19f3c0fa1fc1be3596abca984e9
Signed-off-by: Arun Prakash <app@codeaurora.org>