msm: npu: Correct buffer address used to copy stats data to user

This change is to fix an invalid buffer address issue used in
copy_to_user to copy stats data to user.

Change-Id: I4dd11e6ab225972875f7c53140ff7a0bef45e22f
Signed-off-by: Jilai Wang <jilaiw@codeaurora.org>