msm: npu: pass command result from fw to user driver

Each command's response from fw will contain a status code which
indicates its execution result. This change is to pass this status
code to user driver as corresponding ioctl command's return code.

Change-Id: I55d1f0b2a70497ed89f48cbdb6a267e5848e5bff
Signed-off-by: Jilai Wang <jilaiw@codeaurora.org>