msm: npu: Fix OOB issue in IPC between driver and firmware

We shoudn't trust the data from firmware, and need to validate
all content before using them.

Change-Id: I832c927a2a67b42a06625f1f62602d9d51e4a78e
Signed-off-by: Jilai Wang <quic_jilaiw@quicinc.com>